tmobile commerical background song?

[Anna P]

whats the song in the background of the new tmobile commerical?
its still if you want to sing out, sing out but its by a new artist..who is it??
its brand new..its by like multiple artist..i just saw it for the first time about 10 mins ago

 

[sienna swizzle-stick]

the artist is Cat Stevens

 

[Nate]

Cat Stevens is the artists its not a new song i dont think.