Another Sparrow ID

I have recently become interested in Sparrows, but I am finding them very difficult to identify since they are so much alike and the field guides I am using are sometimes unclear or appear conflicting (Sibley's, National Geographic, Audubon and Smithsonian) I would appreciate your ID and advise. Thanks,

I'm not a sparrow expert either but there are flocks of this sparrow here in Colorado right now.

I was wrong, this could be a song sparrow and I think ours are chipping sparrows.

Looks like a Song Sparrow to me too, Joseph....

Thank you for your responses...Song Sparrow it is....