What is the most difficult piece of music?

It's hard to even begin to quantify what the "most difficult piece of music" is, but if we look at it through the lens of Physical Virtuosity and Conceptual Virtuosity, we can at least get a good idea of what difficult in music even means, and what are some contenders for the most difficult piece of music.
𝄢 Kyle Gann’s take on Ben Johnston’s 7th String Quartet
www.artsjournal.com/postclassi...
𝄢 Cristina Deutekom slaying the Queen of the Night like some sort of robot synthesizer
• Cristina Deutekom: "De...
𝄢 ALASH (Tuvan Throat Singing)
• Alash Demonstrate Thro...
𝄢 YEFIM BRONFMAN (Rachmaninoff Piano Concerto no. 3 in D Minor)
• Yefim Bronfman: Rachma...
𝄢 Paganini Caprice no. 24 performed by Alexander Markov (absolutely badass!)
• Paganini Caprice no.24...
𝄢 ERUPTION covers
• Eddie Van Halen Erupti...
• Van Halen - Eruption G...
• Van Halen Eruption Cover
• 8th grader playing Edd...
𝄢 Covers of THE BLACK PAGE
• The Black Page, by Fra...
• Frank Zappa's Black Pa...
• Ensemble Musikfabrik |...
• The Black Page no. 1 -...
𝄢 Covers of Failing
• Failing -Tom Johnson
• Yoshiaki Horiguchi, Fa...
• "Failing: a very diffi...
• Johnson - Failing Sus...
• Failing - A very diffi...
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