 It was not the BBC's practice to archive either the session tapes or the shows' master tapes, owing to storage space and contractual restrictions.The first collection of Beatles BBC performances was the bootleg album "Yellow Matter Custard", issued in 1971, consisting of 14 songs that were probably off-air home recordings made during the original radio broadcasts.Some additional performances with similar "tinny" sound appeared on other bootlegs in the following years; then in 1980, the bootleg "The Beatles Broadcasts" was released featuring 18 BBC songs with superior sound quality.