The U.S. Bureau of Prisons says it introduced a new program which allows federal prison inmates to carry MP3 players with personalized playlists that can be chosen from a prison library of about 1 million songs. “The MP3 program is intended to help inmates deal with issues such as idleness, stress and boredom associated with incarceration. Keeping inmates constructively occupied is essential to the safety,” says bureau spokeswoman Traci Billingsley. Some tracks, however, will be excluded from the song list. Material deemed obscene or with racially-charged language will be prohibited.