Power trio

Larger rock bands often use one or more additional rhythm sections to fill out the sound with chords and harmony parts.

[1] The rise of the power trio in the 1960s was made possible in part by developments in amplifier technology that greatly enhanced the volume of the electric guitar and bass.

In 1964, Frank Zappa played guitar in a power trio, the Muthers, with Paul Woods on bass and Les Papp on drums.

[2] In 1966, the prototypical blues-rock power trio Cream[3] was formed, consisting of Eric Clapton on guitar/vocals, Jack Bruce on bass/vocals, and Ginger Baker on drums.

In 1968, the power trio Manal was formed in Argentina, and were the first group that composed blues music in Spanish.