CHER: (Singing) Do you believe in life after love? MARTIN: You heard that little warble in her voice? That was produced by Auto-Tune. That's a studio tool that digitally changes a singer's pitch. Cher ...

This is FRESH AIR. Every year, a sleigh full of Christmas music gets released, and rock critic Ken Tucker has been listening to a lot of it. He's narrowed down his list to two new releases. Cher has ...