Bassey – The EMI/UA Years 1959–1979 is a 5-CD boxset compilation from Shirley Bassey issued in 1994, this set features 94 studio recordings on four CDs, recorded for EMI/United Artists between 1959 and 1979. Disc five features a previously unreleased live recording from Carnegie Hall. The boxset was reissued by EMI in 2010 in a standard jewel case set. All tracks appear here in stereo, the original singles released between 1959 and 1969 were released in mono. Later re-issues on compilations were stereo versions of the mono singles, these are the versions featured here. Original mono single recordings made for EMI Columbia were re-issued in 2006 on the 2-CD set The Complete EMI/Columbia Singles Collection. It was not unusual in this era to make a recording twice, as recording methods for mono and stereo were very different. This created two recordings of the same song, with differing vocals and instrumentation. Both versions were released on separate albums, making two versions of an album available. Mono albums were less expensive and it took a few years before stereo became the dominant market. Later all recordings were made in stereo but were mixed to mono for single releases. From Wikipedia (https://en.wikipedia.org/wiki/Bassey_...) under Creative Commons Attribution CC-BY-SA 3.0 (https://creativecommons.org/licenses/...)