Shelley's solo debut album "Sky Yen" was recorded in 1974 but remained unheard until it was released on 12" vinyl on Shelley's own label, Groovy Records, in March 1980. It was recorded as a continuous piece of music using a purpose-built oscillator, and used layered electronics and playback speed manipulation to achieve its experimental feel. Rooted in electronic music, it has been compared with krautrock. Also released on Groovy Records was the soundtrack LP "Hangahar" by Sally Timms and Lindsay Lee, which included Shelley as a musician, and an album by artists Eric Random, Barry Adamson and Francis Cookson under the name "Free Agents". Groovy Records did not release any other records.