+**C90** refers to a popular length of [Compact Cassette](/wiki/Compact_Cassette) tape, providing 45 minutes of [Audio Recording](/wiki/Audio_Recording) time per side. This standard offered a generous capacity, often ideal for a full album or curated playlist. It became a defining medium for sharing sound in the analog era.
+## See also
+- [C60](/wiki/C60)
+- [Cassette Player](/wiki/Cassette_Player)
+- [Mixtape](/wiki/Mixtape)
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