bird song questions

["Debbi B" dgbrusco]

I recently recorded these two files (see the ones beginning with 
"DS") with a voice recorder (not terribly close so they aren't all 
that clear). I wasn't out to record higher-quality this time, I just 
wanted something very small and which I could just press one button 
to record something for documentation.

So--there is one (DS_20029..) with Western Bluebird calls, and in 
between those are the calls I'm interested in. They were coming from 
high in some oaks in southern Alameda County, CA. Any ideas?

The other recording (DS_20023..) is a Dark-eyed Junco adult. It, or 
another male, also performed its trill and I was prompted to say to 
another birder that it sounded like spring. My question on this one 
is, what kind of song is it?

http://briefcase.yahoo.com/bc/dgbrusco/lst?.dir=/Sounds&.view=l

Debbi