indeed there are good tracks a-plenty on this sampler;
- but i thought it worthwhile advising that ''embyo'' was regarded as a work-in-progress by its creators rather than a finished track ready for release, as quite a bit of the premium dealers were and had been asking for copies after it ceased to be available new from emi was - sometimes explicitly - related to its containing a significant pink floyd track not elsewise available.
track A3, "embryo", was released on this double sampler without pink floyd's permission, and they regarded it then as an unfinished work, not ready for release at that time - or, as it then was, indeed, ever.