Original: 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.
Simplified: 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".