I've seen a lot of orchestral classical music mentioned, so I'll suggest looking at solo piano and some concertos.
The essentials for solo piano:
Chopin ballade 1 - https://www.youtube.com/watch?v=RR7eUSFsn28
Beethoven Moonlight/Pathetique/Appasionata sonatas- https://www.youtube.com/watch?v=GXjhc8EbY4I
https://www.youtube.com/watch?v=a8XYrNrlBj4 https://www.youtube.com/watch?v=4C3TIr2bBo0
Mozart A minor sonata- https://www.youtube.com/watch?v=OWIEI9Qn_cA
Concertos:
Rachmaninoff 2/3 piano concertos- https://www.youtube.com/watch?v=EWgYg5Iicqk https://www.youtube.com/watch?v=MOOfoW5_2iE
Sibelius violin concerto- https://www.youtube.com/watch?v=ITTbY1n3Iz8
Mendelssohn violin concerto- https://www.youtube.com/watch?v=o1dBg__wsuo
Tchaikovsky violin concerto- https://www.youtube.com/watch?v=fKhZP3TdrA8
Dvorak cello concerto- https://www.youtube.com/watch?v=I002Aq1o3Pg
Elgar cello concerto- https://www.youtube.com/watch?v=ngcxp4yn_Fg