Band (rock and pop) facts for kids
A rock band or pop band is a small group of musicians who play rock music, pop music, or similar styles. These bands usually have a few members. The most common setup for a rock or pop band is having four people.
Before electronic keyboards became popular, a typical four-person band had two guitarists (one playing lead melodies and solos, the other playing rhythm chords), a bassist, and a drummer. Often, one of the guitarists also sang the main vocals. Famous examples of this type of band include the Who, Led Zeppelin, and Queen. Even with two guitarists, the main instruments often worked together like a three-person group.

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How Many Musicians Are in a Band?
The smallest group often seen in rock music is a trio, meaning three members. Bands with only two members, like The White Stripes or The Black Keys, are quite rare. This is because it's hard for just two people to play all the different parts needed for a rock or pop song, like vocals, chords, bass lines, and drums.
The Power Trio
In hard rock, blues-rock, or heavy metal music, a special type of trio called a "power trio" is often used. This group has an electric guitar player, an electric bass guitar player, and a drummer. Usually, one or more of these musicians also sing. Sometimes all three members sing, like the Bee Gees.
Many famous power trios have the guitarist as the lead singer, such as the Jimi Hendrix Experience, Nirvana, and Green Day. Other power trios feature the bass guitarist as the lead singer, like Cream, Rush, and The Police.

Bigger Bands: More Instruments, More Sounds
Rock and pop music have also featured larger bands for a long time. This was partly influenced by the way singers like Frank Sinatra performed with big jazz orchestras.
To make a bigger sound, rock bands often add more musicians. They might include an extra guitarist, another keyboard player, more drummers or percussionists, or even a whole horn section (like trumpets and saxophones). Sometimes, a flautist (someone who plays the flute) is also added.
For example, the band Toto had six members: a lead singer, a guitarist, a bassist, two keyboard players, and a drummer. Other bands like INXS and Blondie also had six members, typically with a lead singer, two guitarists, a keyboard player, a bassist, and a drummer. In some larger groups, like the Band, musicians could play several different instruments. This allowed them to create many different sounds and combinations.
Images for kids
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The Jimi Hendrix Experience, a power trio, performing for Dutch television in 1967: From left to right: singer-guitarist Jimi Hendrix, bassist Noel Redding, and drummer Mitch Mitchell.
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Red Hot Chili Peppers is a four-person band with a lead vocalist, guitarist, bassist, and drummer.
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The Strokes are a five-person band with a lead vocalist, two guitarists, a bassist, and a drummer.
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Iron Maiden is a six-person band with a lead vocalist, three guitarists, a bassist, and a drummer. (Not shown in this image are Bruce Dickinson and Nicko McBrain.)
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Suzi Quatro is a singer, bassist, and bandleader. When she started her career in 1973, she was one of the few well-known women who played an instrument and led a band.