This may seem weird, but ... :
Recall violinists , who always have their chins red from
keeping instruments on the shoulder.
Recall akkordeon players, who use their chin for switching registers.
Organists are playing with feet and that's already about 1000 years,
and playing with feet seems of course more exotic than playing with
the chin :) . By the way, in my transcription of Bach
Organ Preludium I play the entire part of feet with
my chin , so one exotic thing takes after the other. :)
you can also hear the grace-note (guitar legato) in
basses played with the CHIN.
two parallel arpegios: ( LES
/ Forest ) p-finger slides down (up in tone) simultaneously
with a normal arpegio by i-m-a
double trill (parallel sixths) simlutaneously with the
melody , played too with double notes (Etude
trill with the right hand ( "Cats" before
long arpegio (7 strings) + melody on the first string
very fast passages (~240 metronom) with p-a-m-i sequence
of the Bumblebee"