Want songs in other languages? Three Hungarian ones:

Elment a madarka

From Branch to Branch

Vetettem violat

There's a version of "Elment a madarka" from Moldavia with a tune I much prefer but it isn't on the web as far as I can see. I've got it on CD.

There are literally thousands of Turkish songs featuring nightingales. An anthemic one with lots of versions on the web:

Don't Sing, Nightingale (Selda Bagcan version)