Peter Gregson - Dancefloor Bach Workshop This image appears in the gallery:Peter Gregson - Dancefloor Bach at the Bristol Proms 8. Peter Gregson - Dancefloor Bach Workshop Gregson sat in the stalls to give his accompaniment. Photo: Gobinder Jhitta 27 images See the full gallery: Peter Gregson - Dancefloor Bach at the Bristol Proms