Extra compositions outside of the one in the link above:

[Alexei Nikolaev] String Quartet No.3 (Score-Video)

[Mikhail Marutaev] String Quartet No 3 in G Minor Op.49 (Score-Video)

Coronation March - Arr. Franco Cesarini

Rachmaninoff: Piano Concerto #3 (Weissenberg 1968) [with score]

Pierre Boulez - Le marteau sans maître

Partita in C Minor, BWV 826, Johann Sebastian Bach, Karmen Grubisic - Piano

You can listen to the above in separate tabs while you're doing other things (for concentration and relaxation and the like).

Enjoy!

Also, don't forget to post or link some of your favorite classical compositions or the ones you're listening to right now.