The music of Leatherbag — aka singer-songwriter Randy Reynolds — is an engaging mix of rootsy Bob Dylan, fully charged Lou Reed and more than a little Buddy Holly. OK, maybe the Holly thing’s just the glasses, though comparing this Austin-based Houston refugee (thanks, Rita!) to Texas’ most famous rock ’n’ roller isn’t that far off the mark, given the keen pop smarts on display throughout Reynolds’ rapidly growing catalog. Keeping up with Leatherbag’s releases can be exhausting — he’s released two EPs this year alone, including this spring’s Everything I Once Knew; but every one of them to date’s been a keeper.