Blackcap Song - Stunning variation and mimicry

Over the last 2 springs I've been bumping into more Blackcaps with variations in their songs, or is it I'm just more aware of them now?
This fine chap is blasting out one the finest songs I've heard from any Blackcap, hardly any original Blackcap notes at all, but really beautiful

Music credits
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Sunrise - Rexlambo https://soundcloud.com/rexlambo​
Creative Commons — Attribution 3.0 Unported — CC BY 3.0
Free Download / Stream: https://bit.ly/sunrise-rexlambo​
Music promoted by Audio Library https://youtu.be/K5RFml_CM04​
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Видео Blackcap Song - Stunning variation and mimicry канала Fraser Cottington