The best orchestral solo, played by the best ever player.
Dennis Brain in 1944 on his piston valve Raoux, before he went over to the dark side and got an Alex, (see below.) Though being a high player, not for him the 103, but a single Bb with A/+ and a manual F extension, I believe. Because it's not only organists who have anoraks. He was probably in RAF uniform too having spent WWII in the RAF Central Band in Bedford, [popping down to London for concerts now and then.
Whilst we're on the subject of Tchaik.
4,5,or 6. Which is your favourite?
For me, it changes. Today 6 or maybe 4, without the pizzicato movement.