The 12-Bar Blues
The most played form in jazz: 12 bars, three chords. A riff repeats and moves with the chords. Count the bars and feel where the form turns back.
29
Phrase
Valves
C · Open
Notation
Bar 1 of 12 · C7
104bpm
70150
Piano sound: Salamander Grand Piano V3 — Alexander Holm, CC BY 3.0
Trumpet sound: University of Iowa Electronic Music Studios