Vinyl records were popular from the 1950s to 1990s for mass-produced commercial music. Cassette tapes, introduced in 1963, allowed portable music listening through Sony's Walkman in the 1980s. Compact discs were developed in the late 1970s/early 1980s by Sony and Philips as a new digital audio format, leading to CD players and portable CD players. MP3 compression was created in 1987 to reduce the storage needs of digitized music files. The iPod, launched in 2001, was one of the most successful digital music players, allowing storage of up to 1000 songs on a portable device.