This instrumental was written by Paul McCartney but is credited to Lennon-McCartney. It was written for the 1968 TV Series of the same name. It was recorded by John Foster And Son Ltd. Black Dyke Mills Band in 1968. It was recorded at Victoria Hall in Saltaire and was produced by Paul McCartney. Thingumybob was released as a single on the Apple label with Yellow Submarine on the B-side. It was the fourth single released on the Apple label.