Part of an ongoing series. Last month, local band The Happy Hollows (MySpace) performed at The Echo (MySpace), opening for The Ruby Suns (MySpace) and Architecture in Helsinki (MySpace). On Sunday, The Happy Hollows' lead singer Sarah Negahdari performs a solo acoustic set at Pehrspace (MySpace) in Echo Park with The Physics of Meaning (MySpace), One Trick Pony (MySpace), and Rademacher (MySpace)'s Malcolm Sosa. Joe from Radio Free Silver Lake raves that "I'm really......