Ever wonder what James Van Osdol would put on a mix CD? How 'bout Chris Connelly or Bobby Conn? Well, tomorrow night you can find out, sort of. Rock for Kids, a non-profit that provides support, assistance and inspiration to children that are homeless or in need, holds its second annual Music Mixer, a silent auction of mix CDs created by local musicians, deejays, rock critics and others -- including a double disc mix by Andrew and Naz from GB! -- at Smartbar, 3730 N. Clark, from 6pm to 10pm. The trick is, the track listings are hidden, so you have to win (or stand really close to the person who does) to find out what's on each CD. Suggested donation of $5 at the door. Call 312/255-9454 for more info.