T-Pain will preview songs from his new mixtape, Stoic, Sunday at 3 p.m. PT/6 p.m. ET via a live Ustream chat with fans. The Ustream player can be viewed on Yahoo! Music.

The online release party will also serve as a celebration of the rapper, producer and actor's 27^th birthday. At the end of the session, the Grammy Award winning artist will release the free album via LiveMixtapes.com.

Prince must enjoy singing "Nothing Compares 2 U" as a duet. On Tuesday, three nights after performing the song with Mary J. Blige at the iHeartRadio Music Festival in Las Vegas, the veteran pop star played the classic with Jennifer Hudson.

Sunday was a good day for Calais Campbell and his Arizona Cardinals teammates. They defeated the New England Patriots, 20 to 18, and Campbell was named NFC Defensive Player Of The Week. During a recent visit to Yahoo!, Campbell talked football and music, specifically, why he still gloats about his infamous Brett Favre sack, prefers to listen to calming music before games, and aspires to write movies.

On sacking Favre in 2009, he bragged, "I have it framed."

Video and editing: Robert Gardner

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Usher, Oprah Winfrey (photo: OWN)Usher, one of the most anticipated performers at this weekend's iHeartRadio Music Festival in Las Vegas, sparked major buzz Sunday after discussing his ex-wife, fatherhood, and protégé Justin Bieber on an episode of Oprah Winfrey's Next Chapter series.

The "OMG" singer, who was recently awarded full custody of his sons with ex Tameka Foster, explained why the court proceedings moved him to tears. "The friend that I was to Tameka, I don't know that I could ever be again, because I really felt like we were friends," Usher told Winfrey during an interview at his Atlanta home. "She made us enemies in a way that I could never [understand]. It wasn't until I was on the stand, where I cried, when I realized, 'Oh, this is an attack.' "