A CD single (sometimes abbreviated to CDS) is a music single in the form of a standard size Compact Disc, not to be confused with the Mini CD single, which uses a smaller form factor. 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 2000s, 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" 45rpm records) up to six songs like an EP. Some contain multiple mixes of one or more songs, in the tradition of 12" vinyl singles. Depending on the nation, there may be limits on the number of songs and total length for sales to count in singles charts.
Read more about CD Single: History
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“I, who cannot stay in my chamber for a single day without acquiring some rust,... confess that I am astonished at the power of endurance, to say nothing of the moral insensibility, of my neighbors who confine themselves to shops and offices the whole day for weeks and months, aye, and years almost together. I know not what manner of stuff they are of,—sitting there now at three o’clock in the afternoon, as if it were three o’clock in the morning.”
—Henry David Thoreau (1817–1862)