Music single in the form of a compact disc / From Wikipedia, the free encyclopedia
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A CD single (sometimes abbreviated to CDS) is a music single in the form of a compact disc. The standard in the Red Book for the term CD single is an 8 cm (3-inch) CD (or Mini CD). It now refers to any single recorded onto a CD of any size, particularly the CD5, or 5-inch CD single. The format was introduced in the mid-1980s but did not gain its place in the market until the early 1990s. With the rise in digital downloads in the early 2010s, sales of CD singles have decreased.
Commercially released CD singles can vary in length from two songs (an A side and B side, in the tradition of 7-inch 45-rpm records) up to six songs like an EP. Some contain multiple mixes of one or more songs (known as remixes), in the tradition of 12-inch vinyl singles, and in some cases, they may also contain a music video for the single itself (this is an enhanced CD) as well as occasionally a poster. Depending on the nation, there may be limits on the number of songs and total length for sales to count in singles charts.