There are several groups called Plus One.
(for artists called +1 go to their wikipage) 1) An 80's new wave band who scored a major dance hit with "Nevermore." The song was a staple of influential DJ Richard Blade's line-up, and he included the song on a popular 80's cd compilation. 2) A Christian pop group formed by Atlantic Records in 2000. The band made up of vocalists Nate Cole, Gabe Combs, Jeremy Mhire, Jason Perry, and Nathan Walters remains one of the best selling artists in Christian pop. After suffering label woes and mis-management, the group disbanded in the fall of 2004.

Read more about Plus One on Last.fm.