A backup vocalist is a member of a group of singers who provide backing vocals to a song.

Pierre Bouvier is the lead vocalist.

Jeff Stinco is the lead guitar.

Sebastien Lefebvre is the rhythm guitar and backing vocalist.

David Desrosiers is the bass and backing vocalist.

And Chuck Comeau is the drummer.

Jung Yonghwa (leader, main vocalist, rapper)

Lee Jonghyun (lead guitarist, vocalist)

Kang Minhyuk (drummer, backing vocals)

Lee Jungshin (bassist, backing vocals, backing rapper)

Lida is a beautiful vocalist and its sad that she didnt go further with her singing .

If we hear someone "talk" during a song, they could be said to narrate or to rap, as both terms apply. Narration predates rapping by a long shot, but numerous examples of both can be found with little effort.