David Hollander is an artist, filmmaker and collector of artist-made films and library music, and co-founder of CineMarfa, a film festival dedicated to showcasing rare and unseen films. For his latest endeavor he's penned _Unusual Sounds: The Hidden History of Library Music_ a 400-page visual celebration of biblical proportions, that brings to life this genre-bending, ready-made musical form.In the heyday of low-budget television and scrappy genre filmmaking, producers who needed a soundtrack for their commercial entertainments could reach for a selection of library music: royalty-free albums of stock recordings whose contents fit any mood required. From jingles, fanfares, bridges and extended scores, library music accompanied the action for cinema, TV shows, advertising and more. Vivian talks to David about this enigmatic musical universe, which has mostly only been accessible to producers and record collectors, plus we'll hear some library music old and new.