[Maine-birds] Unidentified bird call

Hi all,

I know nearly all the birdcalls around my house through the season, but I just started hearing a new one; two notes, the second one rising up in pitch, volume, and length. Very loud, one of the loudest around. The closest I can think is a cardinal, but it's always these exact two notes.

We're on a lake near Winthrop, Maine.

Any thoughts much appreciated, to help me narrow my search.

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