The 1969 album Then Play On, Peter Green's last with Fleetwood Mac, signaled a spiritual quest already in progress. Jan Persson/Redferns hide caption

itoggle caption Jan Persson/Redferns

Peter Gabriel's new album, And I'll Scratch Yours, comes out Jan. 7. Courtesy of the artist hide caption

itoggle caption Courtesy of the artist

In his music, Josh Garrels says, he tries to "peel back layers" of what it means to be a Christian. Sasha Arutyunova/Courtesy of the artist hide caption

itoggle caption Sasha Arutyunova/Courtesy of the artist