Produced by Brian Eno and Rhett Davies, over 100 tracks were written for 1977's Before and After Science with only 10 making the album's final cut. The musical styles featured range from energetic and jagged to more languid and ethereal. The album marks Eno's last foray into rock music in the ‘70s as a solo artist, with all his remaining records of the decade showcasing more of his ambient music, which was hinted at on the second half of Before and After Science. Unlike Eno's previous efforts which were recorded in a very short time, it was two years in the making, during which he was busy working on his solo albums Music for Films and Discreet Music, as well as Bowie's Heroes and Low. Here Eno worked with Fred Frith, Jaki Liebezeit of Can, Cluster, Dave Mattacks of Fairport Convention, Andy Fraser of Free, Percy Jones, Phil Collins, Robert Fripp, Paul Rudolph of Hawkwind, Bill MacCormick from Matching Mole/Quiet Sun , Phil Manzanera and Robert Wyatt who went under the pseudonym of Shirley Williams.