Live vocals from Justin against studio backtrack, from 'The Lost Performance (Live in Paris '70)' filmed for French tv.
https://www.themoviedb.org/movie/401180-the-moody-blues-the-lost-performance-live-in-paris-70?language=en-US
http://www.progarchives.com/album.asp?id=14532
https://www.allmusic.com/album/the-lost-performance-live-in-paris-70-dvd-mw0001345193