Craig Robertson, has not only played the ukulele for many years, he hosts a gaggle of uke musicians in a roundtable of styles on the instrument. ''Noir" audiences have come to expect all kinds of music — Tin Pan Alley, classical, and swing. Since the first ''Noir" in 2004, Robertson has found a core of 12 players whom he rotates among special guests in 20-minute, cabaret-style sets.