Sting, Patti Smith and KE$HA are teaming up to cover songs by folk legend Bob Dylan for a new charity compilation.
British soul star Adele and the Dave Matthews Band are also contributing tracks to Chimes of Freedom: Songs of Bob Dylan Honoring 50 Years of Amnesty International, which will benefit the human rights group.
Ke$ha reveals she broke down in tears recording her version of 1963 hit Don't Think Twice, It's All Right - because Dylan is one of her musical heroes.
She tells Rolling Stone magazine, "When you think of me, you wouldn't think of Bob Dylan. My music is more about going crazy than politics. But he's a huge influence - he writes his own music and means what he says. I write my own music and I f**king mean every work I sing. (In the song) you can hear the snot running down my face."