[mou] ID Inquiry

[Pastor Al Schirmacher]

After 13 years of birding, one hates to appear ignorant - but on last
evening's Aitkin trip we heard a song we could not ID.

The two birds were singing at 8:30 PM along Aitkin CR 5, about three layers
back in rather open mixed woods, upper canopy.  The song was long, ~25 notes
on average, with repetitions up to six notes.  One set of notes was
goldfinch-like, similar to the flight call, but without the Doppler effect a
goldfinch often has.  The other notes were more flute-like, slightly
ascending & rather sharp at the end, a bit jumbled.  Those notes would be
first, followed by the finch-like notes, followed by a second set.  Neither
bird responded to pishing (or wishing).

I know that written song descriptions are difficult to work from, but any
ideas?

Thanks!

Al Schirmacher
Princeton, MN
Mille Lacs & Sherburne Counties