Nelly in his song 'Just a Dream'. I don't know any more. Sorry.
Justin Bieber didn't sing to Usher because he wanted to get rich, he sang to him because he wanted to show Usher his talent. At first when Justin met Usher he asked to sing for him but Usher wasn't interested, then he sang U Got It Bad for him a while later.
When he was singing in front of Usher he sang the song "You Got It Bad". This was the song he sang when he met Usher for the first time.
on the song somebody to love
No, they sang a duet together though.
Justin Bieber
Justin bieber sang in front of usher and Justin timberlake and they fought over him and usher got him. so usher
Obviously, it's called touring...
well Justin sang to him and that's how he became famous and now usher is his manger or something
Without You was sung by Usher but the artist is David Guetta.
because he sang with him and showed him dance moves
Justin Bieber has sang with Usher, Jasmine Villages, Rascal Flatts, and Jaden Smith
One time