Pink Floyd's Echoes came on my Ipod today - which I absolutely love, but I thought at that time that I hadn't heard this one for ages, another one from an ancient mixtape I was once given... :)
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The studio recording was originally released as the B-side of their single "Point Me at the Sky" and is also featured on the Relics compilation album; live versions can also be found on Ummagumma and in the film Pink Floyd: Live at Pompeii.
http://en.wikipedia.org/wiki/Careful_with_That_Axe,_Eugene 6