Beautiful bird song, but what is it?

All day every day this little bird sits in either the mulberry or the pine tree, singing its little heart out.  When it's in the mulberry it's backlit by the sun so I can't get a photo of it and when it's in the pine tree it's hidden by the branches so still no photo.

This afternoon, I put my camera on the fence post and left it to run on video for a minute to capture the song.  Please have a listen, there isn't much to see apart from the branches swaying in the breeze, but if you know which bird it is, then please leave a comment at the bottom of this post.

Someone must know what it is!

Got some photo's now and we think it is a chaffinch ...