On Stage is a live recording of four songs performed on Kate Bush's Tour of Life in 1979.
However, it was also released on 12" vinyl in some countries (Japan, Netherlands, Canada, France and Australia - with 45RPM and 33RPM speeds).
In the UK EMI issued the EP (as a promotional item) over four sides of two 7" discs packaged in a gatefold sleeve.
Canada also issued a variant of the 7" single in a gatefold sleeve packaged inside a limited edition 12" outer cover.
Studio versions of all four songs were originally released on her first two albums; "Them Heavy People", "James and the Cold Gun" and "L'Amour Looks Something Like You" from The Kick Inside (1978) and "Don't Push Your Foot on the Heartbrake" from Lionheart (1978).