Comedian Jack Gallagher’s new show “Five Songs” runs through March 1 at B Street Theater. Gallagher is working off a list of 25 songs (with a story attached to each song). The audience picks four songs, Jack picks one, and that's the show on a given night. But you're going to see a different show on different nights as the audience picks different songs and Jack goes into his monologue based on that song. And they aren't all songs that Jack likes.