C – D♭ – D♯ – E – F♯ – G – A – B♭ – C
Where you are with it
C7b9 · C13b9
Eight notes alternating half and whole steps. Dominant spelling shows flat 9, sharp 9, major 3, sharp 11, 5, 13 and flat 7.
Written C on B♭ trumpet sounds concert B♭.
● valve down · ○ valve up