As ringleader of The Shins, James Mercer has left a busload of bandmates on the hard shoulder over the past two decades. His longest lasting act must be Broken Bells, this occasional project with best mate Brian “Danger Mouse” Burton. The duo’s first two albums established a pattern of flirting convincingly with various genres (new wave, folk, prog, post-punk) before ghosting them entirely. Impressive, but weirdly hard to enjoy. Into the Blue, their third album, is similarly promiscuous, but more frequently dazzling.