A transposing instrument reads music written at a different pitch than it sounds. The written part is shifted so the player’s fingerings stay consistent across the family, while a piano (a concert-pitch, non-transposing instrument) sounds exactly what is on the page. That mismatch is why a Tenor Saxophone (B♭) playing from a piano’s sheet music will sound in the wrong key unless the part is transposed first.
Written → concert notes
What each written note sounds like at concert (piano) pitch on the Tenor Saxophone (B♭):
| Written note | Sounds (concert) |
|---|---|
| C | B♭ |
| D | C |
| E | D |
| F | E♭ |
| G | F |
| A | G |
| B | A |
Key-signature conversion (concert → written)
To turn a piano (concert) key into the Tenor Saxophone (B♭)’s written key, move up a major second:
| Concert (piano) key | Written key |
|---|---|
| C major | D major |
| G major | A major |
| D major | E major |
| A major | B major |
| F major | G major |
| B♭ major | C major |
| E♭ major | F major |
| A♭ major | B♭ major |
Why the Tenor Saxophone (B♭) is pitched in B♭
Instruments in a family are built in different keys so a player can move between them without relearning fingerings. On the Tenor Saxophone (B♭), the same fingering that produces a written C sounds concert B♭; writing the part up a major second lets the player keep those familiar fingerings. For the pianist, the practical takeaway is the reverse: hand a Tenor Saxophone (B♭) player your concert-pitch music transposed up a major second, or you’ll be a major second apart.
Tenor Saxophone (B♭) transposition — FAQ
What does written C sound like on the Tenor Saxophone (B♭)?
How do I transpose a piano part for the Tenor Saxophone (B♭)?
What key is the Tenor Saxophone (B♭) in?
Related
Conversions are computed from the instrument’s transposition interval using interval math, not a hand-typed table, so every enharmonic spelling is correct.