I also agree that Atom Heart Mother is far too under-rated. I love that song. It was definately a turning point in a transitional period for the band. IMHO, PF could not have gone on to make DSOTM or WYWH without having created the title song to AHM. It was indeed the combined learning from AHM and Meddle that allowed the band to create DSOTM and WYWH.

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"And so I throw the windows wide
And call to you across the sky"