what is the new song Kino hears?

I'm not sure which new song you mean. In Chapter 2 Kino hears the Song of the Undersea,

"...as he filled his basket the song was in Kino, and the beat of the song was his pounding heart as it ate the oxygen from his held breath, and the melody of the song was the gray-green water and the little scuttlilng animals and clouds of fish...." (pg 17)

Later on in the novel when he is obsessed with the Pearl and men are hunting him, Kino hears the "song of evil."