Bird songs are the sounds that birds make that sound appealing to humans.
Interesting!  WHat would be an example of it?
Any bird call or sound they make that sounds good.
Neat!  For how long have humans been doing this?
It is birds that do it, not humans.
Oh, I see.  I was confused.  Thank you for clearing that up.  Is there a particular bird that has a more appealing call?
That's okay. The distinction between songs and calls is based upon complexity and length
Really!  So, are there researchers that actually study this and classify bird calls?