One note on the staff, four choices. Bass players who read badly usually read fine on the E string and count lines everywhere else, and flashcards fix that faster than tunes do.
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Name the note. Ledger lines included, because that's where reading falls apart.
Reading gets you through the chart. The Complete Jazz Bassist is what you play once you're off it.
The ii-V-I vocabulary, the bebop scales, the modes, the chords, and how to solo over a standard.
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