I heard what may be the same individual about a month ago, given that it was the same quadrant on the top of Mt Tabor. When I heard it I assumed it was a warbler song I didn't know, maybe a species I'd never seen. Once I tracked down the source I moved on w/o elaborate examination of the singer. I think it was a typical looking "Oregon" Junco. I had a bird singing at my house (25 miles nw of Portland, continuous forest in the neighborhood) for three years that I at first assumed was a Black-throated Gray Warbler. It was a month too early for that species, but I didn't track it down until the second year, when it proved to be a very ordinary looking Oregon junco. No trill of any kind in the song. I don't know if it attracted a mate, but I don't believe any other male juncos occupied the yard when it was around. It was here at least three springs, for the full season. Lars