B-side definitions

bē'sīd'
The reverse side of a phonograph record, especially a single.
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An extra recording released along with a featured performance, as on a CD.
noun
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The reverse side of a phonograph record, especially of a vinyl single.
noun
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Any song included on a compact disc single, besides the first song (the A-side).
noun
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Origin of b-side

From the B on the record's label