Tchaikovsky said that the oboe solo in B-flat minor in the second movement of his Symphony No. 4 was `` the feeling that you get when you are all alone '' . Some important oboe solos in this key in the orchestral literature include the second movement of Tchaikovsky 's Symphony No. 4 , which depicts `` the feeling that you get when you are all alone '' , in Tchaikovsky 's words . Tchaikovsky 's Piano Concerto No. 1 is also in B-flat minor .