[spacechild1]

Oh, you're opening up a huge topic there. Actually, there have been philosophers who claimed that the beauty/sublimity of nature was ultimately superior to the sensations produces by the arts. You can find this reasoning in Kant's "Kritik der Urteilskraft", for example.

On the other hand, you have composers like John Cage (or more recently: Peter Ablinger) who claim that the act of listening itself can be/create art, blurring the borders between nature and art. There are conceptual pieces which only consist of listening instructions.

Finally, bird "songs" have been used as the source material for musical composition for centuries. You can find it in Beethoven, Mahler, Debussy, Stravinsky, etc. Olivier Messiaen even was a hobby ornithologist; he faithfully transcribed hundreds of bird songs and used them in his music (see for example his piano cycle "Catalogue d’oiseaux").

As for the question of who composed the actual bird songs, the answer probably depends on the theological background of the person you ask ;-)