It has to do with the old 78 RPM records. A 78 can hold about 3 minutes of music without having to flip them, so a song couldn’t really be more than 3 minutes long in practice.
While modern media can hold songs of much longer lengths the practice of having a song be about 3 minutes never really changed. People expect at song to be about 3 minutes long, so songs are generally written to be about 3 minutes long.
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