Nearing two decades of musical exploration, Scotland’s Mogwai could remix their catalog and create new albums that would blow away any competition. But they're musicians foremost; writing, jamming, crafting, and modifying their music is what they do. Rave Tapes is a gorgeous, if surprisingly sedate, look at what time in their Castle of Doom recording studios yielded in 2013, at a time when they’d completed their delicious score for the French TV show Les Revenants and were performing their music for Zidane: A 21st Century Portrait. This emphasis on incidental music led their own album into cathartic yet sweetly mild tracks such as “Deesh” and “Remurdered,” where the sense of danger is matched with a symmetry and harmony that keeps the music beautiful from end to end. “Repelish” humorously dovetails modest power chords with some square narration regarding the once-perceived “satanism” of Led Zeppelin’s music. On “Master Card,” Mogwai raise the tempo and the guitar riffs for a track unlike much else on Rave Tapes.