Portland's Glass Candy have recently transformed themselves from an attractive glam-punk trio into a white-hot Italo disco machine. Johnny Jewel lays down spare drum beats, strutting bass, fried guitar, glittering synths, and Moroder arpeggios while drop-dead vocalist Ida No whispers and wails through druggy echoes and reverbs. Their live shows have always been satisfying mixes of spectacle and substance (or substances). Once, at Yo-Yo a Go-Go, No's pants were falling down for the entirety of their performance. (The Comet, 922 E Pike St, 323-9853, 9 pm, $7, 21+.)