Hi Janet (and anyone else who isn't currently chasing the Red-throated Pipit), Since 95% of Oregon's top birders are probably overwhelming the septic systems around Lake Selmac right now, I will try to respond. It is really hard to judge bird songs from a written description. Hutton's Vireos have a very monotonous song (just "zu-weeep, .... zu-weeep" over and over, and extremely regular). The variability that you describe, and the similarity to Red-eyed Vireo that you mention, makes me think that you were more likely hearing a Western Purple Finch. They are indeed less burry sounding than, say, Cassin's Vireo. Hopefully this is not too much of a downer, since you still have a couple of very cool lifers to celebrate today (Varied Thrush and Red-breasted Sapsucker). And I could very well be wrong, since it's hard to go from a written description. If you can find a way to send me the sound file, I'll give it another shot. Good birding, Joel