Answer
Rimsky-Korsakov and Borodin often got credit for musical ideas that originated in Balakirev's works. Balakirev was a Russian composer and musicologist who was a central figure in the Russian nationalist movement in music. He was the founder of the "Mighty Five" group of composers, which included Rimsky-Korsakov and Borodin. Balakirev was a prolific composer, but many of his works were unfinished or left in a fragmentary state.