C – D – E – F – G – A – B♭ – C
Where you are with it
C7 · C9 · C13 · V chords
Major with a ♭7. This is the sound of every dominant chord in a blues.
Written C on B♭ trumpet sounds concert B♭.
Learn dominant 7 licks that use C mixolydian.
● valve down · ○ valve up