Normally Monday is songwriter night at Rumba Cafe, 2507 Summit St., and in a sense tonight's visit from April Smith and the Great Picture Show is a one-woman songwriter showcase too. But Smith's sassy cabaret act bears little resemblance to the acoustic strummers who usually saddle up at Cowtown Round. Imagine a scrubbed-up Shilpa Ray or a boozed-up Zooey Deschanel with Tom Waits' sense of variety and showmanship. Her "Songs For a Sinking Ship" is a winner, the sort of record that grabs you and charms you from the start. Her stage show is said to be equally magnetic. It'll cost you $10 at the door, which opens at 9 p.m.