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In many cases, two-member bands will omit a drummer, since guitars, bass guitars, and keyboards can all be used to provide a rhythmic pulse.
Examples of two-member bands are Pet Shop Boys, Hella, Flight of the Conchords, the Ting Tings, Hall & Oates and Twenty One Pilots.
Some bands will have a guitarist, bassist, drummer, and keyboard player, for example the Talking Heads, the Small Faces and Pink Floyd.
Some bands will have the bassist on lead vocals, such as Thin Lizzy, Pink Floyd, Motörhead, or even the lead guitarist, such as Dire Straits, Megadeth and Creedence Clearwater Revival.
This lineup often leads to songs that are fairly simple and accessible, as the frontman (or frontwoman) will have to sing and play guitar at the same time.
A variant of the organ trio are trios formed with an electric bassist, a drummer and an electronic keyboardist (playing synthesizers) such as the progressive rock band Emerson, Lake & Palmer.
A power trio with the guitarist on lead vocals is a popular record company lineup, as the guitarist and singer will usually be the songwriter.
In a hard rock or blues-rock band, or heavy metal rock group, a "power trio" format is often used, which consists of an electric guitar player, an electric bass guitar player and a drummer, and typically one or more of these musicians also sing (sometimes all three members will sing, e.g. Some well-known power trios with the guitarist on lead vocals are the Jimi Hendrix Experience, Stevie Ray Vaughan and Double Trouble and Nirvana.
A handful of others with the bassist on vocals include Primus, Rush, Motörhead, the Police and Cream. For example, in the band Blink-182 vocals are split between bassist Mark Hoppus and guitarist Tom De Longe, or in the band Dinosaur Jr., guitarist J.
Two-member rock and pop bands are relatively rare, because of the difficulty in providing all of the musical elements which are part of the rock or pop sound (vocals, chordal accompaniment, bass lines, and percussion or drumming).