Charles Leo Gebhardt IV is not a German aristocrat. He's a local guitarist/vocalist who's played with Unnatural Helpers and many others, and he's in high demand in the scene for his irrepressible cheerfulness. It manifests in songs that dashingly bound their way into your heart with taut guitar jangles and earwormy melodies. Cop Gebhardt's Unfaithful EP for vivid proof of the man's ramshackle, lo-fi charm. With Case Studies and Orca Team. (Cairo, 507 E Mercer St, 453-4077, 8 pm, $5, all ages)