In many rock and metal bands (e.g., the power trio), the musicians doing backing vocals also play instruments, such as guitar, electric bass or keyboards.
In some pop and hip-hop groups and in musical theater, they may be required to perform dance routines while singing through headset microphones.
In hardcore punk or rockabilly, other band members who play instruments may sing or shout backing vocals during the chorus (refrain) section of the songs.
Ringo Starr, while not as prominent as a backup singer due to his distinctive voice, sings backing vocals in such tracks as "The Continuing Story of Bungalow Bill" and "Carry That Weight".
The members of Crosby, Stills, Nash & Young and Bee Gees each wrote songs, sang backup or lead vocals, and played various instruments in their performances and recordings.
[1] Other artists who have recorded multitrack lead and backing vocals include Patrick Stump of Fall Out Boy, Tom DeLonge of Blink-182 and Angels and Airwaves, Wednesday 13 in his own band and Murderdolls, Ian Gillan of Deep Purple, Brendon Urie of Panic!