There are plenty of bands out there playing Beatles songs, but only one — the Baja Bugs — concentrates on the group’s early days. The band appears at the Griffin on Saturday, March 17. While it does perform the occasional later tune, this quartet excels at mixing R&B and rock classics by the likes of Chuck Berry, from the Fab Four’s pre-worldwide fame bar days and with Lennon-McCartney originals from the Beatles’ first few albums. The Baja Bugs feature Hector Penalosa, one of the best bassists to ever call San Diego home, and criminally underrated guitarist Xavier Anaya, so the music is top-notch. But best of all, it’s played with the same energy and spirit as the band whose music they cover. This is no clichéd study. This is great rock ’n’ roll played gritty, loud and storming. • The Baja Bugs perform at 8 p.m. on Saturday, March 17 at The Griffin, 1310 Morena Blvd. 21 and up. No cover. www.thegriffinsd.com