When so many artists are in one place, there are always bound to be some surprises. During his set at this year's SXSW festival, rapper 2 Chainz brought out G.O.O.D. Music's Kanye West and Big Sean to perform "Marvin Gaye & Chardonnay" and "Dance (A$$)." Watch them perform above.

In addition, 2 Chainz told Fuse that he'd changed the title of debut album to Based On a T.R.U. Story. The original title of the album was T.R.U. 2 My REALigion, succeeding last year's exceptional T.R.U. REALigion. Watch him explain the name change below.

In other 2 Chainz-related news, he dropped a new song yesterday called "Like Me" that samples The Weeknd. Check it out here.

[via mahoganydaneTV & Fuse]