Judging from the YouTube videos of pianist Matt Johnson's dueling piano concerts, it's safe to say the guy caters to bachelor and bachelorette parties. He can easily break into Journey's ""Don't Stop Believing'" and then segue into Billy Joel's "The Piano Man," which he tends to alter with a few of his own ribald lyrics. Expect rowdy sing-a-longs and a boisterous performance. Matt Johnson's Dueling Piano Fiasco! Concerts takes place tonight and tomorrow night at 8 at the Hard Rock Rocksino Northfield Park. Tickets are $6. (Niesel)