Backache Exercise therapy -- See Also Back exercises Here are entered works on exercises for strengthening the muscles of the back. Works on therapeutic exercises for backache are entered under Backache--Exercise therapy.
Background music for motion pictures -- See Motion picture music Here are entered musical works composed for sound films or performed on soundtracks. Works about unaltered motion picture soundtracks that may include speech, sound effects, music, etc., are entered under Film soundtracks. Musical works composed or adapted to accompany silent films are entered under Silent film music.
Background music for radio -- See Radio music This heading is assigned to music composed or arranged for radio programs, such as their theme songs or background music. Songs and other musical works about radio are entered under Radio--Songs and music.
Background music for television -- See Television music This heading is assigned to music composed or arranged for television programs, such as their theme songs or background music. Songs and other musical works about television are entered under Television--Songs and music.