That typically Victorian, post-Mendelssohnian composer, Sir Alexander Mackenzie, under whose baton I played once or twice in my early London days, had none other than young Mischa Elman, then at the most glamorous stage of his career, play one of Mackenzie's extremely long works at a Hans Richter Concert. All I remember of this is Elman’s ravishing performance and the vague feeling that I was present at a belated première, belated by some four or five decades. What if neither Elman nor anyone else has ever played it since?