I live in Topanga Canyon, which is like a faux-rustic enclave in Los Angeles. I love the sounds of all the critters outside - the frogs, owls, crickets, and birds. Some of the birds around here are pretty accomplished musicians. You can learn a lot from them.
What I consider to be the barometer for what is a rock artist and what is not, is somebody who has a certain element of blues, even a hint of soul or blues music, derivative of African-American blues, folk, spiritual, or gospel.