New York-based Thumbplay said it now has distribution agreements with three of the top four record labels with today’s addition of Sony (NYSE: SNE) BMG. The new partnership adds about 7,000 pieces of content to its catalog of more than 80,000 ringtones, wallpapers, games and videos. The company already had relationships with EMI and Universal Music Group. With the addition of Sony BMG, Thumbplay has access to content from artists such as Dido, Michael Jackson, Chris Brown and Alicia Keys.

That leaves Warner Music Group (NYSE: WMG) as only major label not working with Thumbplay. Earlier this week, it was reported that Warner Music was expected to join Sony BMG in signing up for Vivendi’s (EPA: VIV) new entertainment portal called Zaoza, which offers unlimited downloads of content—including music, ringtones, video clips and games.

Thumbplay also has announced recently that its mobile catalog will be available through Web and mobile portals such as AOL (NYSE: TWX), MSN Mobile and iLike and Qloud.