I think the longest songs I know of are around 20 minutes. At least the ones I like, but I can't actually remember a longer one I didn't?
How long can one go?
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@BatElite I think @epsicola told me about a song that's 50 minutes long.
If we're including classical music, then something that comes to mind is The Rite of Spring/Le Sacre du Printemps by Igor Stravinsky – even though the shee music is divided into multiple movements, they're played with no break between them, so the full perfomance goes for 40-45 minutes.
@lizardsquid @epsicola That sounds like a loooong song, maybe the entire hecking album.
I don't know classical music, but it seems a weirdly different beast.