This isn’t one of those ironic band names. The Echo Park sextet is built around the actual brother-sister singing and songwriting duo of Rob and Rachel Kolar. But there’s an air of roleplay to almost everything else about them, from their instrumental lineup (guitars, cello, bass, percussion, tap dancer) to their colorful backgrounds — variously, avant-garde theatre companies, an “exotic 10-piece tribal dance party,” collaboration with a plucked-from-obscurity psychedelic folkie and film work with Michael Cera, according to the bio — and their bright, bohemian, era-spanning look (add to that no less than four costume changes in their recent tour van-funding PledgeMusic video). The musical result is equally dynamic, and perhaps not quite as out-there as you’d expect: ragtag, retro California sunshine pop played with early rock ‘n’ roll energy, the talented tap dancer keeping crisply syncopated time all the while. Their self-titled EP is truly catchy stuff, and, happily, there’s a full-length on the way soon.