ii V I iv in Bb

This practice session features a slow jazz groove in the key of Bb (which is a popular key for jazz songs, do to it being an easier key for horn players – especially saxophone and trumpet players – to play in).

Bb Major Scale (2 options):
C Dorian Mode (2 options):

Playing the Bb Major Scale, but starting and ending with the 2nd note (C), is the C Dorian mode. Since this progression starts with a C minor chords, using this mode works well.