Happy, that vid of the bird brings back memories of about four years ago... I lived in the country and played harmonica a lot to pass the time while enjoying a beer at the end of the day...
We have mocking birds that fly north in the summer and they are excellent repeaters. This little bird would drive me nuts. He had the ring to my phone down solid... He'd wait till he seen me outside and make me walk back in. Can't tell you how many times he got me and I knew he was there!
Anyway, one of the first songs I learned was "Dixie" and this bird had, (And I wish I was in Dixie, ho-ray, ho-ray) too a TEE, clear as a bell... I actually taught him after hearing him repeat a few notes.
He came back year after year for about three years and then no more... The last year I seen him, he had an ambulance siren down pat from where he must have lived in the winter..