Mystery warbler. (1 Viewer)

During the last three days I have heard and seen what I think is a Sylvia warbler resembling a Western/Eastern Orphean Warbler. The bird gave very good repetitive renditions of its song which was VERY reminiscent of that of Black-headed Bunting. I am stumped at the moment becuase the song is not riot right for either of the orphean warblers. I live in Samovodene, near Veliko Tarnovo, Bulgaria. Any suggestions would be very much appreciated. Thank you in advance.

Lesser whitethroat?

Hi Stevo - it isn't a Lesser Whitethroat, I'm pretty sure. I will try to photograph the bird but I may need some assistance uploading the image(s).