Quoting David Baron <d_baron(a)012.net.il>il>:
My daughter bought a bunch of songs from Sony's music downloads to my Sony-
Ericson cell-phone. They are similar sizes to mp3's but seem to only play on
the phone.
How might one play them in linux or on a normal mp3 player?
Have you tried using mplayer?
If you have sndfile-info installed (usually from the package named
libsndfile-progs or similar) you can run that on the file and see if
it can identify it.
You probably won't be able to play it in a normal mp3 player without
converting it to mp3 first.
the file might be DRM-protected. In that case you can't play it on anything other than
the
phone.