Lo-fi psych-pop band Unknown Mortal Orchestra grow and refine their sound by leaps and bounds on their second album. While the band’s fine self-titled debut reveled in its Syd Barret-inspired weirdness, II ups the ante by funneling its odd turns into pop songs that seem to activate new nodes in your brain. “From the Sun” makes like a White Album demo, stuffing its rich arrangement into the washing machine — it comes out with colors mismatched but intact. “Swim and Sleep (Like a Shark)” is high-flying indie-pop that doesn’t have to ask to make itself at home on loop. By the time you’re three songs in, with the soft vintage soul of “So Good at Being in Trouble,” II becomes remarkable rather than merely enjoyable. From space-rock (“No Need for a Leader”) to glammy soul (“Secret Xtians”) to Madchester-style Britpop (“Faded in the Morning”), Unknown Mortal Orchestra seem to have digested decades worth of bargain-bin records and made the sounds their own on II.