Jazz fans talk often about the need to introduce the music to younger fans. Live in the KNKX studios, drummer Sammy Miller and his band of 20-somethings are getting their attention by having fun. Their just-released debut "The Mixtape" is a solid document, but the real fun is in seeing this group in action live. Working a few originals into their energized versions of classic jazz and vaudeville-era pop tunes, this is a band determined to entertain you, in the tradition of scarf-waving Louis