you guys arent thinking properly, the best ones are these,

one of these days
the great gig in the sky
saucerful of secrets
signs of life
moby dick (led zepplin)
any colour you like
Pow r Toc H
intersteller overdrive
on the run

i know it seems lieka pretty one eyed list but pink floyd knew how to write instrumentals and there is no denying it, unless you do deny it, but that is pointless, oh my......

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I love instrumentals, they define a band