Mobile entertainment Web site Thumbplay has signed a distribution deal with Sony BMG Music Entertainment for ringtones, music videos and other mobile content from Sony artists.

The Sony deal, announced today (Feb. 21), will add 7,000 pieces of music-related content to Thumbplay’s library of more than 80,000 pieces of ringtones, wallpaper, games, videos, voice tones and other mobile content. Thumbplay already has distribution and licensing deals with EMI and Universal Music group.

“The popular artists signed with Sony BMG’s labels are a compelling addition to the Thumbplay catalog,” Thumbplay CEO/founder Are Traasdahl said. “This deal reinforces Thumbplay’s position as the leading U.S. provider of mobile content to consumers who are looking to discover and manage their personalized mobile entertainment experience.”

Thumbplay has more than 4 million customers. The company recently signed deals to reach an even broader audience by integrating its catalog into mobile sites AOL and MSN Mobile, as well as social music discovery services iLike and Qloud.