Performing under pressure is hard, and there’s no doubt that accompanying a full choir is stressful even for the most unflappable of musicians.
But this is just… something else. During a performance of Handel’s Messiah, at that crucial moment at the end of the ‘Hallelujah’ Chorus when the choir and organ come together in four glorious final chords, this organist completely loses it.
He sort of recovers it by adding an unexpected seventh at the end, before finally landing on the tonic chord. But man, it’s bad.
In all likelihood, the organist probably accidentally pressed the transpose function on his instrument… but the choir deserves a huge pat on the back for holding it together.
And if you'd like to dive into the music theory of this most unexpected final cadence, someone has transcribed the moment note for note.