...E-flat minor, like B-flat minor and D-flat major, is another key favored almost exclusively by the Russian composers-examples include the sixth symphonies of Prokofiev and Myaskovsky as well as Rachmaninov's Elegie (which I am learning on the piano) and Etude Tableau no. 5, Khachaturian's Toccata, Shostakovich's SQ 15 and Eshpai's Symphony no. 1. Vyacheslav Ovchinnikov has the honor of writing two symphonies in this key (his first and second)! Also Ivanovs' epic Symphony no. 4 Atlantis. Some non-Russian/Soviet pieces in this key include van Gilse's Symphony no. 2 and Rudolf Karel's Renaissance Symphony. But, most famous of all, Stevie Wonder's song Superstition ;D
And Lyapunov: Piano Concerto No. 1. Also the finale of Balakirev's PC 2, which is in the tonic major.