I think it is entirely possible with BiaB to have fills, turnarounds and short solos that complement the singer and the melody. FWIW I frequently will regen many, many times to get the "right" feel and often I comp tracks at the bar level down to sometimes a note or two - even rhythm tracks. A single track in my DAW may be comprised of bits and pieces of 15-20 or more regens. Worth the trouble? Dunno but hey that's what the Bud part of J&B does smile