GrandEvolution is a band that has a lot of contradictions working for it: Take Mike Gendron’s driving guitar, Scott Kenyon’s thundering drums, and Jeff Siatkowski’s rock-steady bass, all of which combine on songs like “Time” into a sound that straddles the line between straight-ahead rock ’n’ roll and contemporary emo, retaining a fresh, almost pop vibrancy. And then there’s Sarah Kollett’s vocals — on songs like the haunting “Another Hope,” her voice is soulful, almost gothic, and yet somehow sweet-sounding.

All these dichotomies combine into a dynamic, engaging band. GrandEvolution, which will be releasing its new CD, plays with The Cautions, The Wandas and New Pilot at 8 p.m. tomorrow at The Lucky Dog Music Hall, 89 Green St., Worcester. 21 +

— Victor D. Infante