B♭4 Trombone Position
How to play B♭4 on the trombone: 1st position. — on the 8th partial, in bass clef, sounding exactly as written.
The diagram shows the trombone from the side with the slide pointing down: the dark bar is the slide brace, and it stops at the numbered marker for this note's position — the slide is all the way in, resting gently against the stops. The staff is in bass clef, the trombone's home clef, and in bass clef the trombone sounds exactly as written.
Hear B♭4 and try the position
Pick an instrument and a note and the diagram updates instantly — filled keys are the ones you press. The same finder sits on every note page, pre-set to that note.
The B♭4 position, step by step
- Move the slide out to 1st position — the slide is all the way in, resting gently against the stops.
- First position is the home position: every harmonic of the open tube is available here, and your lips and air choose which one sounds.
- Check the pitch against the harmonic: if the note will not speak cleanly, the slide is usually close and the lips are aiming at the wrong partial — re-centre the buzz before moving the slide further.
In short: 1st position.
Alternate position for B♭4
3rd position.
On the D5 harmonic, this version is a favourite for passages descending from D5 and C5: the slide is already near 3rd position, and the note speaks with the same embouchure family as its neighbours.
About B♭4 on the trombone
The high register rides the 8th partial and above, where the rungs of the ladder crowd together and the lips do most of the selecting. Positions up here are the short ones — mostly 1st to 5th — and several notes are standard in two positions. Accuracy comes from hearing the exact partial before you play, not from slide athleticism.
B♭4 is note 25 of the 32 in the full trombone slide position chart, sitting between A4 below it and B4 above it. Like every position on this site, it was checked against Yamaha’s official chart and the NoteAtlas slide position chart before publishing.
Practising B♭4
High notes need faster air through a smaller aperture, never more mouthpiece pressure. Practise this note in short bursts with rests between, approaching it by slur from the note a third below, and stop while it still feels easy.
Questions about B♭4
What position is B♭4 on trombone?
1st position. B♭4 is played on the 8th partial (harmonic) of the trombone's tube in the high register. The full step-by-step is on this page, and you can hear the note with the Fingering Finder.
Does B♭4 sound as written on trombone?
Yes. In bass clef the trombone is a non-transposing instrument, so written B♭4 sounds as concert B♭4 — the same pitch a piano plays. Only brass-band treble-clef parts transpose.
Is there an alternate position for B♭4?
Yes — 3rd position. On the D5 harmonic, this version is a favourite for passages descending from D5 and C5: the slide is already near 3rd position, and the note speaks with the same embouchure family as its neighbours.
Think this position is wrong? Report it — every report is checked against the source charts.