Yahoo has turned to CBS to help keep its LAUNCHcast streaming radio service alive. As part of the new partnership, CBS Radio will provide the player and handle the ad sales for LAUNCHcast, and various CBS (NYSE: CBS) stations will be available on Yahoo (NSDQ: YHOO) Music. Yahoo will also incorporate more radio content throughout its news and sports portals. It’s the latest move in Yahoo’s strategy to “completely open” its music operations to other services: the company recently launched an enhanced music search service with Rhapsody. CBS Radio’s ad sales expertise is a big plus: it has a 1,600-member sales team, can sell ads on national and local levels, and has a vested interest in TargetSpot, the ad technology firm that can serve hypertargeted ads into various types of streaming media. CBS also has experience with a partnership of this size, as it merged its online radio network with AOL’s back in March.