The U-S bureau of prisons is testing the idea of allowing iPods at a women's prison in West Virginia.
If all goes well, it would allow them for many of its 200-thousand or so inmates nationwide this year.
The mp3's would be sold at the prison.
Inmates will have access to a song list of about a million titles, but no songs with explicit lyrics will be downloaded.
A bureau spokeswoman says the music could help prisoners deal with idleness, boredom and stress.