How Audio Pros 'Upmix' Vintage Tracks and Give Them New Life

When James Clarke went to work at London's legendary Abbey Road Studios in late 2009, he wasn't an audio engineer. He'd been hired to work as a software programmer. One day not long after he started, he was having lunch with several studio veterans of the 1960s and '70s, the pre-computer era of music recording when songs were captured on a single piece of tape. To make conversation, Clarke asked a seemingly innocent question: Could you take a tape from the days before multitrack recording and isolate the individual instruments? Could you pull it apart?