A random 2-5-1 with the chord tones spelled out, and a timer that moves on whether you're ready or not. Most players can do this in three keys and avoid the rest for a decade.
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Twelve keys of 2-5-1 is the drill. The Complete Jazz Bassist is the language around it.
The ii-V-I vocabulary, the bebop scales, the modes, the chords, and how to solo over a standard.
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