United Kingdom, Sept. 25 -- U2 frontman Bono "can't even listen" to Dolly Parton's final song.

The country legend died in August after a secret battle with cancer and it's now been revealed she put her illness to one side to record a song called Torn with the band for their new album Carnaval De Luz in June, just two months before her death in August.

Bono has now confessed he still can't listen back to the track because it's too emotional for him. He told Rolling Stone: " When she got ill, she got out of her bed to sing this song. And you can hear that. And I can't even listen to it now."

The singer revealed he had talked to Dolly about working with him on a side project which is inspired by Irish folk music but she ended up offering ...