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The double bass is the last and largest member of the string family: a body around 1,070 mm, a string length around 1,050 mm — played standing up or from a high stool.
It is also the family's odd one out. Every other violin-family instrument follows one set of rules: symmetrical round shoulders, fifths tuning, and notation at sounding pitch. The double bass breaks all three:
| Classification | Value |
|---|---|
| HS class | Chordophone — the vibrating body is the string itself |
| Sub-type | Friction-excited (bowed) · necked, with a box resonator |
| Family | Western · Strings |
| Bayin | Not applicable — the eight categories are a Chinese system; the double bass is outside it |
Structure: three departures from the family
1. Sloped shoulders. The left shoulder — the side the player's hand reaches past for high positions — is cut away in a slope, while the right shoulder stays round. That is not styling: bowing and reaching up there both need the clearance. 2. Machine tuning gears. String tension is far too high for wooden friction pegs, so the double bass uses metal geared machines — the same idea as a bass guitar's tuners. 3. A comparatively short fingerboard. Measured with the same ruler as before, its string length (1,050 mm) is nearly equal to its body length (1,070 mm) — the only member where that happens; on a violin the ratio is just 0.92. Another sign that the double bass has grown as far as it can.
Why fourths tuning
This is the most frequently asked question about the instrument, and the answer is not musical. It is about hands.
The family's string lengths differ enormously: violin 328 mm, cello 690 mm, double bass 1,050 mm. String length decides one thing above all — how far a hand must travel for a given interval. Working from the string-length-to-frequency relationship, a whole tone (two semitones) lands at:
On a violin a whole tone is about 36 mm — comfortably inside one hand. On a double bass it is 115 mm — more than three times as far, and that is the smallest distance the hand must cover. Two consequences follow:
- Tuning moves from fifths to fourths. A smaller interval between adjacent strings means the hand does not have to reach so far sideways when crossing strings.
- Fingering moves from 1-2-3-4 to 1-2-4. The third finger is skipped, because the stretch from the first to the third finger already exceeds a natural hand span.
So a bass player's left hand is not really "stopping notes" — it is shifting constantly. That slightly gliding continuity in fast bass lines comes from exactly this.
Range
⚠️ 低音提琴是移调乐器 —— 记谱比实音高一个八度。上面一行是记谱，下面一行是实际听到的音高。
A little over three octaves. Note the two rows on the chart: the double bass is the only member of the family notated as a transposing instrument — an E2 on the page sounds as E1. The reason is practical: writing sounding pitch in bass clef would push a great many notes below the staff, beyond any sensible number of ledger lines.
The lowest note, E1 = 41.2 Hz, sits just about at the edge of clearly pitched low sound. Below it lies the 20–40 Hz region, which you feel more than you hear as pitch. So "bigger is better" stops being true here: the instrument is already pressed against that boundary.
| String | Open note | Colour |
|---|---|---|
| E | E1 | deepest; pitch sense starts to blur, it reads as weight |
| A | A1 | full; the orchestra's usual bass register |
| D | D2 | clear, the workhorse of bass lines |
| G | G2 | the brightest — where jazz soloists climb |
The clef is bass clef; high passages switch to treble clef, with the same octave relationship to sounding pitch.
Timbre, and how to hear it
Recognising a double bass works differently from the rest of the family:
1. Its bottom end reads as weight, not as note. On the E string you register pressure and thickness more than pitch — a consequence of approaching the hearing limit, not a playing fault. 2. Its real voice appears higher up. On the D and G strings, climbing to G3 and G4, it stops being a foundation and starts to sing — a colour between a cello and a low male voice. 3. Plucked and bowed sound like two instruments. Jazz bass is almost all pizzicato: short, grainy, sharp-edged. An orchestral bass is long notes and legato: soft, dark, spread out.
The player below gives the four open strings. Listen to how far E1 is from G2 in character — the first two read as weight, the last two as pitch.
The tracks under “Listen in the library” are the skeleton of the music — transcription or engraving MIDI — while timbre is handled by the player above. One transparency note: only four tracks in the library carry a title or composer that identifies them unambiguously as double-bass music, and all four are listed here. That is a limit of the dataset, not a selection made on this page.
Playing techniques
The right hand has two bow grips, unique in the family:
- French bow (overhand): palm down, structurally like the cello's French bow.
- German bow (underhand): palm up, cradling the frog — the older tradition inherited from the bass viol.
The two schools are complete systems (weight distribution, wrist action, spiccato all differ), and both survive among professional players today.
The left hand follows the previous section: 1-2-4 fingering plus constant shifting. The rest of the technique is shared with the family, with a few things that need separate work on this instrument:
- Pizzicato: thick strings and high tension mean the whole hand, not just a finger. In jazz it is a solo language — walking lines, double stops, slaps — not decoration.
- Harmonics: the longer the string, the further apart its nodes, and the easier they are to hear. A double bass's natural harmonics are clearer than a violin's.
- Bow hair tension: thick strings need more pressure, but too much chokes the string and kills the harmonics. Controlling that line is the hardest part of the right hand.
- Hold and endpin: most basses use an endpin, but some players — especially in jazz and folk — brace the instrument against the body to pluck it, and both the posture and the sound change.
The family
The double bass sits in the string section, but its lineage is different: it descends from the bass viol (violone), not from an enlarged violin family. Three traces survive in today's instrument:
| Feature | Violin family | Double bass (viol lineage) |
|---|---|---|
| Shoulders | symmetrical, round | sloped (left shoulder cut away) |
| Tuning | perfect fifths | perfect fourths |
| Notation | at sounding pitch | transposing (an octave higher) |
| Back | arched like the top | flatter (the viol's shallower break) |
| Bow grip | one system | two (German and French) |
| Instrument | Body | String length | Tuning (low→high) | Range |
|---|---|---|---|---|
| Violin | 356 mm | 328 mm | G3 D4 A4 E5 | G3–E7 |
| Viola | 410 mm | 370 mm | C3 G3 D4 A4 | C3–E6 |
| Cello | 760 mm | 690 mm | C2 G2 D3 A3 | C2–C6 |
| Double bass | 1,070 mm | 1,050 mm | E1 A1 D2 G2 | E1–G4 |
So the most accurate way to put it: they are one family, but the double bass came in carrying an older name.
History
The double bass's ancestor is the 16th-century bass viol / violone — a huge fretted bass string instrument tuned in a mix of fourths and fifths. When the violin family displaced the viols in the 17th century, the bass register did not change blood: the new instrument kept the old one's tuning and proportions, so the sloped shoulders and fourths tuning survive to this day.
Eighteenth-century basses usually had three strings (A1, D2, G2). The fourth string (E1) came later and only then gave the instrument the depth an orchestral bass part needs. Dragonetti is the figure of that period: his technique and his works made the double bass a plausible solo instrument in the late 18th century.
In the 19th century Bottesini did for the double bass what the great virtuosi did for the violin — called "the Paganini of the double bass", he pushed solo technique to its limit and left concertos and character pieces. The solo tradition is essentially this line.
In the 20th century the instrument split across two stages: the orchestral bass part (bowed, long notes, foundation) and the jazz bass (plucked, walking, improvising). One instrument, two almost unrelated techniques — also a first in this family.
Common misconceptions
- "A double bass is an enlarged cello." Similar in outline, but the lineage differs: it comes from the bass viol (violone). Sloped shoulders, fourths tuning, transposing notation and two bow grips are all viol traces — none of which "enlargement" explains.
- "It can only go thump, thump, thump." That is a common way to write for the orchestral bass part, not the instrument's ceiling. The solo tradition runs from Dragonetti to Bottesini without a break, and in jazz it is a solo voice.
- "What you read is what sounds." Backwards. The double bass is a transposing instrument, notated an octave above sounding pitch. The two rows on the range chart show it.
- "Thicker strings mean lower notes." The main variable is string length. The double bass is a bass instrument first because its strings are 1,050 mm (over three times a violin's); gauge and tension are the supporting adjustments.
- "Fourths tuning was chosen because fourths sound better." It was chosen for hands, not for sound. At 1,050 mm, fifths tuning would demand too wide a lateral stretch between adjacent strings. Another case of a body limiting the instrument — the previous example is the viola's size problem.
- "A double bass is harder because it is bigger." It is certainly more physical (thicker strings, wider spacing, more pressure needed), but the real difficulty is shifting: because intonation depends on moving the whole hand, there is less room for error.
Next
That completes the four Western bowed strings. For comparison: the violin entry gives the family's shared shape and craft, the viola is the story of size forced into compromise, and this page is the story of a rule being changed. Together they show one thing clearly: an instrument's form is a negotiation between acoustic need and the human body. :::
Listen in the library
All tracks from midicn-lib — inline badge is the license tier (C1 commercial / C2 non-commercial / C3 study only).
Sources
- 琴体尺寸取通行制琴数据：低音提琴（3/4 尺寸，乐队最常用）琴体长约 1,070 毫米、弦长约 1,050 毫米
- 定弦 E–A–D–G（纯四度）与"记谱比实音高一个八度"属通行乐器学常识，各版乐器词典表述一致，本文为原创表述
- 全音指距的换算依弦长与频率关系逐条计算（小提琴 328 毫米得约 36 毫米、大提琴 690 毫米得约 75 毫米、低音提琴 1,050 毫米得约 115 毫米）
- 血统上出自低音维奥尔（violone）而非小提琴家族的放大、以及德式与法式两种握弓，依通行乐器史叙述
- ⚠️ 库内标题或作曲家明确指向低音提琴的曲目只找到 4 首，本条已全部列出（数据集覆盖限制，非本页取舍）
Used for fact-checking only; all prose is original.