Apart from the Burmans, Kumar worked with other famous music directors too. The composer duo Laxmikant–Pyarelal (L-P) composed many songs sung by him, including "Mere Mehboob Qayamat Hogi" from Mr. X in Bombay, "Mere Naseeb Mein Aye Dost" from Do Raaste, "Yeh Jeevan Hai" from Piya Ka Ghar, "Mere Dil Mein Aaj Kya Hai" from Daag, "Nahi Mai Nahi Dekh Sakta" from Majboor, "Mere Diwanepan Ki Bhi" from Mehboob Ki Mehndi, "Naach Meri Bulbul" from Roti, "Chal Chal Chal Mere Haathi" from Haathi Mere Saathi and "Tu Kitne Baras Ki" from Karz. L-P also worked with Kishore and Mohammed Rafi on duets for the films Zakhmee, Dostana, Ram Balram and Deedaar-E-Yaar. L-P composed "I Love You (Kaate Nahin Katate Yeh Din Yeh Raat)" for Mr. India (1987), a duet with Kishore and Alisha Chinoy.
