The Lark Ascending- Ralph Vaughan Williams

Upon Hearing the First Cuckoo in Spring- Frederick Delius

Albatross- Peter Green with the early Fleetwood Mac. Don't know if those high parts are supposed to evoke song but the initial theme does bring to mind the flight of a large sea bird.

I guess a bunch of O'Carolan tunes like Quarrel with the Landlady, as well as Shebeg sound "birdy" at times.