hmm if is HAS to be jazz then...
as falls wichita so falls wichita falls by Pat n Lyle is probly longest at 20.41
unless the windchimes by mike oldfield counts... at 21.49...
i think surprise, surprise by mezzoforte has to be the shortest, its 0.34s
if we can use other genres then 17 by smashing pumpkins must be the shortest piece of music at surprisingly 0.17s.
and longest looks like itll have to be voyage 34 by porcupine tree at a stonking 29.48.
also, i know the original version of Moonloop by porcupine tree was 45 minutes, this was cut down in various forms for albums, but the complete thing was released to fan club subscribers only a few months ago. which is nice.
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Julian: "Are you aware of the music known as jazz?"
Noel: "Jazz, what's that, 1984, Matt Bianco (sings badly) What is lo-o-o-ove anywa-a-a-y, does anybody love anybody anyway?"
Julian: "No, jazz. You fear jazz. You fear the lack of rules, the lack of boundaries. Oh look, it's a fence. But, no, it's soft."