After short tours of the UK and Scandinavia, and three sold-out shows at the famous L'Olympia, Paris, France, the Rolling Stones hit the United States for the third time in their career. During the tour (April 23 - May 29, 1965) the band once again returned to their favourite US studios (Chess Studios and RCA Studios) to record new material for single and album release.
On May 10 the Stones entered Chess Studios, Chicago, to record some five songs, among which cover versions of Don Covay's "Mercy Mercy", and Roosevelt Jamison's "That's How Strong My Love Is" (a song made popular by Otis Redding), and a Nanker-Phelge group composition called "The Under Assistent West Coast Promotion Man".
Ian Stewart's presence during the sessions was pretty clear, as is shown by his piano playing on "The Under Assistent", a composition which gently pokes fun at George Sherlock who accompanied the Stones as a representative of their American-based label, London Records. The song is akin to "Off The Hook", another Nanker-Phelge composition.