As long as I can remember, I've been a good singer. I've also always enjoyed singing, so the thousands of hours of practice accumulated during childhood, in the car, in the shower, etc. didn't really seem like "hard work". I wouldn't say I've had to work to develop my singing ability in the same way Derek has.
We sang in church, and I took cello lessons and was involved in a choir, but neither of them actively played an instrument. My mother was also a good singer.