So - the one I have, is the bass clef version which has all the tunes written out in bass clef and some written bass lines - although mostly chord charts so that you can improvise walking bass lines (etc.) as Mingus would have done.
There are no actual transcriptions of solos or improvised bass lines - just the written parts.
My copy also has two CDs - one for you to play along with... and one where the members of the Mingus big band plays some arrangements for small Jazz group
