Why do birds sing?

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"In How Music Works, David Byrne cites some scientifically controversial theories suggesting that music is a spontaneous rather than adaptive phenomenon and birds sing simply because they enjoy singing. At the front lines of the joy theory of bird song is new-age philosopher and jazz musician David Rothenberg, who argues that bird song has the formal properties of music and, just like human music, is motivated by pleasure — another manifestation of the emotional lives of animals. In the preface to his 2006 book Why Birds Sing: A Journey Into the Mystery of Birdsong (public library; UK), Rothenberg writes:

"As a philosopher, I have long been wrapped in the question of what humanity must do to find a home in the natural world. The seemingly innocent topic of bird song shows us that we need a combination of many visions of nature to make sense of the whole. … I hope to inspire more scientists and musicians in engaged interaction with the natural world." " https://www.brainpickings.org/2013/01/30/why-birds-sing/

https://academy.allaboutbirds.org/birdsong/