Question: which American singer-songwriter and guitarist did  Up 'til Now mixed with his solo 
Sentence (from "Up 'til Now"): The album is a mixture of three previously released solo tracks (including a track from "The Animals' Christmas"), seven new songs (including a duet with James Taylor and a track from an earlier recording session left off the "Scissors Cut" album), and two alternate takes of previously released songs.
Relevant evidence: Yes