SBJ'S- Small Brown Jobs! Who Am I?

As I sat in my car on the far side of Karval lake a small visitor came and posed for me. I took several pictures and found him a challenge to Identify. Much smaller than the White-Crowned Sparrows that were in the Salt-Cedars with him. He had distinct markings on his face, and back. The streaked crown and color on the back ruled out Chipping Sparrow for me. The noticeable facial pattern made me question Brewer's Sparrow. They seem to have a less distinctively marked faces. Could this be a Clay-Colored Sparrow? Experts out there get out your field guides and give our SBJ a name. By the way his song was a low buzz of two to four syllables, much lower pitched than Chipping Sparrows.