Question: The Piano Concerto No. 1 in B-flat minor, Op. 23 was composed by which Russian composer of the romantic period, some of whose works are among the most popular music in the classical repertoire?
Sentence (from "Piano Concerto No. 1 (Tchaikovsky)"): The first version received heavy criticism from Nikolai Rubinstein, Tchaikovsky's desired pianist.
Relevant evidence: No