T-Mobile US today exempted another 14 streaming music services from its data caps, including Google Play Music, Xbox Music, and SoundCloud.

The carrier's "Music Freedom" program lets customers stream music without using up limited high-speed data, and isn't subject to throttling triggered by data overages. (T-Mobile Simple Choice customers are throttled rather than being cut off from data completely after hitting monthly limits.) Music Freedom began by exempting Pandora, Rhapsody, iHeartRadio, iTunes Radio, Samsung Milk, Slacker, and Spotify. Grooveshark, Rdio, and others were added later. T-Mobile today said it boosted the list of exempt services to 27 by adding 14 new ones.

Besides Google Play Music, Xbox Music, and SoundCloud, newly exempt services are RadioTunes, Digitally Imported, Fit Radio, Fresca Radio, JazzRadio, Live365, Mad Genius Radio, radioPup, radio.com, RockRadio, and Saavn.

While beneficial for music loving customers, T-Mobile's program was criticized by net neutrality advocates who said carriers use data caps to create artificial scarcity and "choose winners and losers online."

On the plus side, T-Mobile is letting virtually all the major music services take advantage of the data cap exemptions, rather than favoring its own partnership with Rhapsody. While AT&T charges content providers for the right to be exempt from data caps, T-Mobile provides the perk to music services for free.

T-Mobile CEO John Legere argues that the Music Freedom program is good for customers and that strict net neutrality rules coupled with reclassifying mobile broadband as a utility would make it more difficult for companies to create consumer-friendly services.