Former Bostonians and full time rockers, Bozmo, may have left our lovely city, but that doesn't mean they can't still kick out the jams. As a matter of fact, the band has just released a new single and a very cool video for “B a Tree.” The single, and accompanying B-side, “Lakehouse,” stick with the classic Bozmo formula of punchy guitars, with a touch of vintage psychedelia stirred in…