"What do you think Junior will be happier to see... A guy with karaoke tracks for him to sing over, or a professional rhythm section with taste and chops and ears? "

Diki..I guess you do not have experience with these drop in celeb acts...

They all prefer and rely on their own backing tracks..usually a CD..In fact they carry the Cd's with them..some even use remote players to play the CD's..

The key is "drop in"..not a scheduled performance...and yes we do back acts the latter way too..

A solo artist[singer] is more likely and willing to sing with me backing her/him by myself...usually just piano and left hand bass..with drums...