The track includes bassist Roger Waters speaking high-pitched vocal gibberish, having sped his voice up in a similar manner to his work with Ron Geesin.
[7] The band decided to make the studio half of Ummagumma a series of solo projects, and so the group-recorded "Embryo" was dropped from the running order.
[14] Live performances featured a different arrangement from the studio version, which was expanded to include instrumental jamming, lasting between 10 and 25 minutes.
After two verses, Waters led a jam session around a two-bar riff on the bass, while tape-recorded noises of young children played in the background, which could be panned around the venue using the azimuth co-ordinator.
[15] Some live performances included making various squeaks and squeals into his reverberated vocal mic (similar to those in "Several Species of Small Furry Animals Gathered Together in a Cave and Grooving with a Pict").
[16] "Embryo" was recorded for two BBC Radio concerts at the Paris Theatre, London, compered by John Peel.