ii-V7 + Tritone sub in 12 keys (Bb instr) 120 bpm

ii-V7 + Tritone sub in 12 keys (Bb instr) 120 bpm. Play over a iim - V7 progression for 2 bars then over a 4 chord Tritone substitution for the next 2 bars, get used to hear the two options next to each other. All in 12 keys, starting with the key of C then moving by 4ths.