Mogwai If Glasgow's Mogwai hadn't been inching toward experimental metal before, the instrumental band is now. There still are uplifting hints of indie slow pop lurking around its seventh studio album, "Hardcore Will Never Die, But You Will," but there are also brief glimpses of '70s sludge — and it is refreshingly wonderful. Mayan Theater, 1038 S. Hill St., L.A. 8 p.m. $25. Goldenvoice.com
Andrew W.K. The hard-partying apologist has released a few albums of absurdly catchy pop-metal, played an improv-heavy piano tour with the Calder Quartet and hosted a motivational-speaking talk show. Now he's back on the road plying what he does best — some of the most unabashedly joyful music in rock. The Echoplex, 1154 Glendale Blvd., L.A. 9 p.m. $15. http://www.attheecho.com
Demetri Martin Though he often wields a guitar, the comedian Demetri Martin deals in brainy, ironic observations and clever wordplay that should be well-suited to the printed page. He will discuss and sign his new collection of essays, musings and drawings, the reflexively titled "This Is a Book." Book Soup, 8818 W. Sunset Blvd., West Hollywood. 7 p.m. Free. (310) 659-3110. http://www.booksoup.com.