English band 10cc were well established by mid-1973, with 'Rubber Bullets' reaching the top of the U.K. singled chart in late June, but old habits die hard: just a week after hitting #1, they released the latest in a string of pseudonymous projects. Joined by Peter Cowap they recorded and released a cover version of 'Da Doo Ron Ron' by The Crystals, using Grumble as their one-off moniker.