1.   Idahoan Doug Martsch and his bandmates take a concept as moribund as the power trio, give it a swift kick and create remarkably fresh-sounding music.

2.   Praxis was a brash rock power trio, joined by DXT on turntables.

3.   The Portland-based alternative power trio opened three nights of sold-out shows at the Roxy in West Hollywood on Wednesday.

4.   With the power trio Cream, Clapton helped pave the way for the excesses of arena rock.