the incidental music was performed by a four-member ensemble. it is mainly electronic in nature and features an electric guitar and accordion, vibraphone and ondes martenot, the last of which was played by series composer barry gray himself. it was recorded on 23 july 1967 in the same studio session as the music for "the launching". "lunarville 7" was the first episode of "captain scarlet" to be produced featuring the lyrical version of the series' ending theme music performed by the spectrum, which was recorded on 26 july 1967.