Following the breakup of a previous band, singer-songwriter-guitarist Ruban Nielson formed a new one, Unknown Mortal Orchestra, three years ago. Despite virtual anonymity, the trio (including Riley Geare and Jake Portrait) gained the attention of the music world thanks to a lone single, the fuzzy, psychedelic-tinged “Ffunny Friends.” The band’s self-titled debut was released in 2011 to near universal acclaim. In a glowing review, Pitchfork said the band “represents a similar merger of simple and catchy melodies lovingly marooned in a raw, buzz-cut production that puts an emphasis on the beats.” Touring in support of the album only served to raise their profile even more. Unknown Mortal Orchestra (above, performing “From the Sun” at this year’s SXSW for KEXP FM) followed their precocious debut with the aptly titled II (stream it below) earlier this year. The album—which again pleased critics and fans alike—traffics in a variety of genres, including psychedelia, funk and blue-eyed soul. See how it all comes together onstage, tomorrow night at Music Hall of Williamsburg.