For all the ringing Rickenbackers, peaked-cap style points (think Donovan), and general '60s approximating, Beachwood Sparks' most eternal number is a reworking of 2000's "By Your Side," a minor hit by pop-soul outfit Sade. Go figure. Feathered with understated instrumentation and supine vocals, the Los Angeles foursome lent a touch of emotional subtlety to Sade's forthright ode to companionship. Of course, Beachwood Sparks are revivalists, not revisers. With layers of coruscating guitars, plush harmonies, and ambiance so golden it veers towards neo-psychedelia, the Sparks' approach evokes predecessors like the Byrds, the Flying Burrito Brothers, and the Beach Boys. With that sort of musical lineage, it's appropriate that their tiny reunion jaunt is whisking the group primarily through California. The Beachwood Sparks perform on Thursday, Aug. 21, at Bottom of the Hill at 9 p.m. Admission is $15; call or visit www.bottomofthehill.com.