In 1977 the duo joined with Brian Eno for recording sessions at Conny Plank's studio. The first release from those sessions was the even softer "Cluster & Eno". Guest musicians on the album included Can bassist Holger Czukay and Asmus Tietchens on synthesizer. The association with Eno brought Cluster a much wider audience and international attention. The second album drawn from the Cluster & Eno sessions, "After the Heat", released on Sky in 1978, featured a much wider variety of styles, including three tracks with vocals by Eno. Holger Czukay again played bass on one track, "Tzima N'arki" which featured the vocals of the Eno track "King's Lead Hat" recorded backwards. Roedelius also began releasing solo material during this period, beginning with "Durch die Wüste" for Sky in 1978.