Chorus Girls

There is a large number of songs in Hindi films, in which there is a chorus of some sort. Usually a girl chorus that sings la, la, la, or something similar. This lends a unique dimension to some songs, like the Jhinga la la hoom chorus in the song   'Hum Bewafa Hargiz na the'   from the film Shalimar.

Some other songs that I can recollect off-hand, that employ a chorus are-

Main chali, main chali dekho pyar ki gali mujhe roke na koi, (film: Padosan) which has a chorus singing la, la, la, meri jaan dekho jaana na wahan, koi pyar ka lutera ..

Hai preet jahan ki reet sada, ..from Purab aur Paschim, a Manoj Kumar film

Woh pari kahan se laun teri dulhan jise banaun ..is sung extensively by a chorus, again in a Manoj Kumar film called Pehchan.

Qawwalis often have a chorus that repeats the last line or word sung by the lead singer.
Example, Hain agar dushman, dushman, zamana gham nahin....koi aaye koi aaye koi hum kisise kam nahin..