Maybe a Brewer's Sparrow?
Looks like a Brewer's Sparrow. As seems to be my curse with the tweeters, something in the way or shadowing the bird.
Terr male singing
Small bird on Mojave Yucca
Brewer's Sparrow (Spizella breweri) is a small, slim species of American sparrow in the family Emberizidae. This bird was named after the ornithologist Thomas Mayo Brewer.