Kishore Kumar, arguably the greatest playback singer that Indian Cinema had seen gave us timeless classics such as ' Chalte Chalte Mere Yeh Geet ', ' Ek Ladki Bhigi Bhagi Si ', ' Koi Humdum Na Raha ', ' Yeh Jeevan Hai ' and other classics till his last song ' Guru Guru Aajao Sanam '. He was at the peak of his filmi career in 70's and 80's.