Instrumentation
The concerto was originally scored for 2 flutes, 2 oboes, 2 clarinets in A and B flat, 2 bassoons, 2 horns in E and E flat, 2 trumpets in C and B flat, 2 trombones, tuba, timpani and strings (violins, violas, cellos and double basses). He later added 2 horns and changed the tuba to a third trombone.
Read more about this topic: Piano Concerto (Grieg)