La Roux, with Colby B. Showbox at the Market, 1426 First Ave., 628-3151. 8 p.m. $16-$18. All ages. English electropop duo La Roux (composed of Elly Jackson and Ben Langmaid) shot to superstardom in 2009, dominating the dance charts with music crammed full of synthesizers and catchy/simpering lyrics. (If their sound seems familiar, dust off the ’80s shelf in your old LP collection, e.g. The Human League and Eurythmics.) On “Toy,” Jackson sulks in a falsetto, “It’s all false love and affection, you don’t want me, you just like the attention.” Sure, it’s been done before, but La Roux’s melancholy retro pop now seems refreshingly sincere in a genre that’s become too polished since the rise of Lady GaGa and her minions. It’s dance music for the dejected–who probably need it the most anyway. ERIKA HOBARTPsychedelic Horseshit, with Eat Skull, Wet Paint, Eel Eater. Comet Tavern, 922 E. Pike St., 323-9853. 8 p.m. $8. The name’s half right – there’s something psychedelic about the racket made by singer-guitarist Matt Whitehurst and drummer Rich Johnston, but it’s worth the work of hunting down. Despite releasing a record called Shitgaze Anthems and kick-starting that genre last decade, Psychedelic Horseshit can be quite catchy and not so noisy. His songs may be subversive, but always in some unexpected way. The first taste of this month’s Acid Tape cassette, “Modern Daze” is a phantom of addled rhythms, sideways melodies, and buried singing. (Think early Sebadoh). It’s enough to forgive the band for skewing towards esoteric formats and secret-handshake labels like Siltbreeze, Woodsist, and Fan Death. DOUG WALLEN