Rachmaninov Piano Concerto No.4 op.40 in G minor - YouTube
Piano Concerto No. 2 (Rachmaninoff) - Wikipedia
Piano Concerto No.4, Op.40 – Sergei Rachmaninoff - I. Allegro vivace (alla breve) Sheet music for Piano, Trombone, Tuba, Flute & more instruments (Mixed Ensemble) | Musescore.com