Kumar Sanu, Udit Narayan

One of the most prolific singers ever to work in the Indian film industry, Kumar Sanu's recorded output numbers in the thousands of songs, reaching by his estimation over 8,000 by the turn of the millennium. Sanu broke the Guinness world record for the largest number of songs recorded in a single day, with 28 -- a testament not only to his polished technique, but to his unparalleled ability to quickly and effortlessly master unfamiliar material in the studio. Sanu also holds the record (along with Lata Mangeshkar on the female side) for the longest string of consecutive Filmfa...