This is a male lark bunting a bird normally seen in the Great Plains in southern Alberta and Saskatchewan in Canada and the Dakotas, Montana,Wyoming,Nebraska and Kansas.
It is distinctive with its black body and white wings.
We made a road trip of about 6 hours each way to see this bird.
Fortunately it co-operated and perched and sang several times.
I couldn't get very close for photos as it flew several times.
It is the only sparrow that changes completely out of a bright breeding plumage into a drab winter one.
source - Cornell Lab of Ornithology.