Universal Music is releasing 100,000 music tracks digitally. They haven’t been available for years. “Records are normally deleted once they cease to sell in sufficient numbers to justify shelf space in stores. It is also not economical for firms to produce low-selling records. No such constraints exist on the net, and both record companies and Hollywood have recognised the advantages of digital content’s “long tail” – they can market a huge back catalogue even if they sell only in small quantities.”