A guest appearance is a participation of an outsider performer usually called guest artist. Guest appearances are often described with the words featuring, with, or and. It is abbreviated in credit lists as Feat., Ft., f. The terms guest role or guest star are also common, the latter term specifically indicating the guest appearance of a celebrity.In the early stages of music videos this was with artists such as Queens "Under pressure" Featuring David Bowie. Although in the early stages on music videos artists were not always credited. For example, Eric Clapton was not credited in print for his guitar in the release of While My Guitar Gently Weeps of The Beatles. Gradually guest appearances have become a fully credited staple of music industry. The custom of guest appearance has become especially prominent in rap music, and this influenced other genres too. In metalcore and rock music it is especially common, often getting other bands vocalists to add screams or clean vocals over tracks. 
In the video for You me at six's track "Bite my tongue" It features guest vocals from Oli Sykes. The singer of You me at six's singer (Josh) and Oli are actually good friends in real life, probably a reason they wanted him to feature over another artist. You me at six are a UK based rock band, often only having clean vocals in their songs. Having a featuring artist such as Oli, who's band primarily use screaming vocals give the band a more diverse sound.In the video Josh begins at the platform of a control panel while his band are playing instruments while his band are held up like puppets on strings. Giving the impression that Josh is in charge and controlling his band. When Oli's part of the song kicks in he throws Josh off the control panel and takes control himself. Showing that both singers are just as important as each other. Its also a good way to get a clear view of both vocalists on camera. In the pictures shown I have screen grabbed the shots from the same camera viewpoint.
