It is said that Jaikishan would count some numbers on his fingers before coming up with the background score for a particular scene on the spot! Two of S-J's films, viz., Sangam (1964) and Mera Naam Joker (1971) are regarded even today as having some of the best background musical scores of Hindi films till date. Although, by and large, it was Jaikishan who used to work on background music of SJ movies as per their mutually agreed division of work, it may be an over-simplification to presume that therefore, whatever went in background scores was solely Jaikishan's creation. Since SJ had a common pool of tunes in their stock, made by either of them during their numerous music sessions/sittings (Riyaz), it was perfectly legitimate and natural for Jaikishan to have used tunes created by Shankar also wherever needed. This is also one of the reasons why he was able to finish this job in a few days' time. It is understood that in RK films, Shankar and Jaikishan both used to work on the background scores. On the other hand, both Shankar and Jaikishan were equally proficient in scoring western music based songs.