Permitting audiophiles scarcely a week to savor 2008’s independent folk revival (Fleet Foxes and Blitzen Trapper each made Rolling Stone’s top 20), Vetiver inaugurated the 2009 campaign with an early release of the band’s fourth LP, Tight Knit. Though the San Francisco band has been laying down rich, layered harmonies drenched in irresistibly precise guitar riffs since their self-titled debut in 2004, Tight Knit is Vetiver’s first team-up with prolific Seattle label Subpop, a move that lets the group develop, master and distribute their tunes on a well-respected indie-music purveyor.