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
http://www.artsjournal.com/postclassic/2010/03/the_mount_everest_of_string_qu.html

𝄢 Cristina Deutekom slaying the Queen of the Night like some sort of robot synthesizer
https://www.youtube.com/watch?v=YQpTGKXAxqA

𝄢 ALASH (Tuvan Throat Singing)
https://www.youtube.com/watch?v=eHdOT64Ycwc

𝄢 YEFIM BRONFMAN (Rachmaninoff Piano Concerto no. 3 in D Minor)
https://www.youtube.com/watch?v=aFkAwFDZGHk

𝄢 Paganini Caprice no. 24 performed by Alexander Markov (absolutely badass!)
https://www.youtube.com/watch?v=PZ307sM0t-0

𝄢 ERUPTION covers
https://www.youtube.com/watch?v=4iTt38Bc85o
https://www.youtube.com/watch?v=rV6SmY04WdE
https://www.youtube.com/watch?v=v1HcxELJzTM
https://www.youtube.com/watch?v=c2WHk4C9OTg

𝄢 Covers of THE BLACK PAGE
https://www.youtube.com/watch?v=H_7qf8M6DiM
https://www.youtube.com/watch?v=4ZNE4iX2i10
https://www.youtube.com/watch?v=ROmJx_S4EMo
https://www.youtube.com/watch?v=RFfWD96y06c

𝄢 Covers of Failing
https://www.youtube.com/watch?v=Xb2X-zsKfl4
https://www.youtube.com/watch?v=XD6GVuESgPs
https://www.youtube.com/watch?v=ykzBY_qC8Oc
https://www.youtube.com/watch?v=V9kjso91MPA
https://www.youtube.com/watch?v=9P8C6-XqaNs&t=126s

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Видео What is the most difficult piece of music? канала Adam Neely