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Definition: Set of releases which belong to the same catalog number sequence.
Example: CK 45012, CK 45013, CK 45014, etc... on Columbia
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Prefix and suffixes can vary, as long as the releases belong the same number sequence.
Example: C 30004 (1970), G 30031 (1970), C 30032 (1970), C2X 30050 (1970)
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Sometimes a number sequence runs through different content types on the same label.
Example: ESCB 1158 (album), ESCB 1292 (EP), ESCB 1294 (album)
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Sometimes a number sequence runs through different labels.
Example: KC 32258 (1973, Columbia), Ks 32265 (1973, Columbia Masterworks), KS 32266 (1973, Columbia Masterworks), KC 32270 (1973, Columbia)
