I remember mohd. rafi, since he was my all time favorite singer. Throughout my school & later college days I used to practice Maths by listening to his songs. I think he was the best singer of his times, no doubt there were versatile singers like mukesh, kishore kumar, manna dey. But for me he was the best. To name his best what i would prefer "Tarif karoon kya uski, jis ne tumhe banaya" from Kashmir ki kali. And host of songs sad, joyful,melodious.