On the disc 13, July 7, 1988, according to the booklet the players are:
Davis, Garrett (sax), Robert Irving III (keybd), Adam Holzman (keybd), Foley (lead bass), Benny Rietveld (bass), Ricky Wellman (drums), Marilyn Mazur (percussions). But I hear a guitar throughout the concert, with some great solos.
Is it a guitar, isn't it?