Can't figure out this bird song

I'm so sorry, I don't actually have a recording of it and I will try to make one.  It basically makes some other call but ends with a "de-dur dur dur dur" with a straight pitching descending slightly at the end of each 'dur'.  

I've gone through the bird calls of all of the birds local and possible and simply can't find it.  

Perhaps it's the blackbirds singing their own signature tune, as I know blackbirds sometimes mimic and variate their songs.  Maybe it's the new robin that now visits.

I will try to record it, but I thought some bird expert may have an idea.  Here's a photo of our female blackbird Suzie just because. :-)