Does anyone out there have any firsthand knowledge of how extensively 16 2/3 rpm was used on 12" vinyl for music (as opposed to spoken word)? I have in front of me 2 VOX XL series records, each of which contains 4 full length romantic concerti (one has liner notes claiming "1 hour 48 minutes 40 seconds of music"). Any comments or info would be appreciated. Peter Hirsch NYPL