Here´s a cool guitar line, usually arranged for piano or something in
a symphony made by norwegian Grieg. It´s really cool to play anyway.
Begin playing these two lines pretty slow.
[ Tab from: https://www.guitartabs.cc/tabs/m/misc_classical/grieg_song_tab.html ]
e----------------------------------------l
b----------------------------------------l
g----------------------------------------l
d----------------------------------------l
a--------0-2---2--1---1--0---0-----------l
E--0-2-3-----3------2------1-------------l
e----------------------------------------l
b----------------------------------------l
g----------------------------------------l
d-----------------2-0--------0-----------l
a--------0-2---2------2----2-------------l
E--0-2-3-----3-----------3---------------l
Then play it faster and faster until you just can´t move your grip
fast enough to continue playing.
Enjoy!