This video is called Barred warbler (Sylvia nisoria) singing. Prespa lake, Greece, May 2012.
This species is rare in western Europe.
From Lothian Bird News in Scotland, on Twitter:
Barred Warbler still at feeders near Torness, also up to 5 Little Egrets at Belhaven Bay.
7:32 PM – 8 Dec 2015