First ever song in Hindi films was sung by Wazir Mohd Khan in Alamara (1931) and was picturized on him as a faqeer. The picture was remade in 1956 and 1973. He played the same role and and sang the same 2-line song, picturized on himself. Here he is in the 1973 version.
De De Khudaa Ke Naam Pe in 1973
Now You Know!