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During the late 1960s, many groups used power trio instrumentation while adding a vocalist.

These include The Who, Black Sabbath, and Free.

Although none of these were ever particularly identified as such, the music that they created is influenced by, and follows the same musical format as, many of the pioneering power trios.

Likewise, Mountain is often erroneously referred to as a power trio, even though there were four instrumentalists ( guitar, bass, drums, and keyboards ) in the band.

Many punk rock bands, for example the Ramones and the Sex Pistols, would follow the power trio plus vocalist model, which was also used by proto-punk band The Stooges.