Dancers perform in Liam Scarlett's adaptation of Marius Petipa and Lev Ivanov's Swan Lake at the Royal Opera House on May 17, 2018. Photo / Getty
When the harpist of the Royal Opera House failed to turn up to a performance of Swan Lake, the perfect stand-in appeared to be waiting in the wings.
As panic reigned backstage, Koen Kessels, the musical director of the Royal Ballet, bravely stepped forward and decided to accompany the orchestra on the piano himself.
However, his impromptu performance did not go entirely to plan.
Some audience members walked out, while others complained about wrong notes played on an out of tune piano.
Kessels grew up playing the piano, but by his own admission lacked the "genius" required to be a world-leading concert pianist. "I can be disciplined when I'm obsessive about something, but I wasn't truly obsessive about the piano," he has said.
He instead chose to be a conductor, after a friend told him that conductors are "the only one who doesn't play an instrument".
This was not the case in this performance on June 8, as Kessels doggedly got through the celebrated harp cadenza and the violin solo with harp accompaniment.
After Act I went ahead without a harp, the Belgian conductor was literally waiting in the wings to step in for Act II and played a piano on the side of the stage, as there was not time to get one into the pit.
The piano he played is usually reserved for warming up performers rather than a concert grand.
Some audience members reportedly walked out on hearing that there was no harp available and the part would be played on the piano.
One member of the audience said that "those of us who stayed witnessed piano playing with lots of wrong notes, on an instrument in desperate need of tuning."
However, others praised Kessels's last-minute rendition. "That was the performance I loved best out of four Swan Lakes I saw during this run", said another audience member.
"Obviously I noticed, because the famous harp bit was played on the piano, but I still enjoyed the performance", they said.
A harpist was eventually found and arrived in time to play Acts III and IV. The confusion led to show finishing around 25 minutes later than planned.
Kessels studied at the Royal Conservatoire in Antwerp and made his conducting debut at the Royal Ballet with a 2008 production of The Nutcracker.
He was previously the music director of the Birmingham Royal Ballet, before being appointed to the same post at the Royal Ballet in the 2015/16 season.
A spokesman for the Royal Opera House said: "It was a particularly unusual circumstance caused by a scheduling mix up".
"Koen Kessels is a conductor, he's not a pianist, he's not a concert pianist. He's an orchestra conductor.