Yahoo put another music track without DRM (digital rights management) on sale through its Yahoo Music service Tuesday. The Norah Jones single "Thinking About You" sells for $0.99, in MP3 format on Yahoo's music store, and in DRM-encumbered AAC format on Apple Computer's iTunes Store. Both formats will play on PCs, Macs, and the market-leading iPod portable music player, but only the MP3 version will play on other portable music players.

Yahoo first experimented with selling MP3 files without DRM in July, when it offered Jessica Simpson's "A Public Affair" as an MP3 file for $1.99. While that track was not tied to a particular PC or music player with DRM, the audio track was personalized to contain a first name of the purchaser's choice, picked from a list of hundreds of prerecorded names, limiting its interest to other listeners.