So do something good for your rhythm and sign up for the Black Lamp drummers' workshop at the Boulder Theater, 2032 14th Street in Boulder. Medeski Martin & Wood beatkeeper Billy Martin, who's performed with a range of artists from John Scofield to Iggy Pop, is teaming up with Brazilian percussionist and composer Cyro Baptista, who's worked on Grammy-winning albums such as Yo-Yo Ma's Obrigado Brasil and Herbie Hancock's Gershwin's World, to focus on Brazilian, West/Central African and funk drumming. There are two workshops today, one from 10:30 a.m. to 12:30 p.m. and another from 2:30 to 4:30 p.m.; each costs $80. Black Lamp will raise the rafters with a performance tonight at 8:30 p.m. for only $20. Call 303-998-9412 or visit www.bouldertheater.com for information.