I'll be getting this, the old volume has been a huge help in piecing together the L A soul and vocal group scene for me. I'm sure the info has been greatly expanded and corrected since that last book. However I would just say that nobody's work is definitive in this area. I recently had a soul fan from another forum let me know of about 10 "mistakes" I'd made in a sleevenote. On checking there were no mistakes he'd just been using the Soul Harmony Singles book as his source and I'd found later information that contradicted and corrected that.