During the 2014 promo campaign for Pono, his high-end digital audio device, Neil Young called his forthcoming album A Letter Home "an art project," which is an appropriate term for this curious collection of covers from his contemporaries. It's not so much that the choice of songs is unusual - nearly all of them are from the '60s and '70s, years when Young was also active, but a handful ("Crazy," "Since I Met You Baby," "I Wonder If I Care as Much") date from the late '50s or early '60s - but the recording method. Young headed down to Jack White's Third Man Records in Nashville where Jack installed a refurbished Voice-O-Graph booth, a device designed to allow a user to "Make Your Own Record" by cutting a song or message directly to vinyl…