Symphonies Nos. 5 & 3 is an album featuring Sergei Prokofiev's Symphony No. 5 in B-flat major, Op. 100, and Symphony No. 3 in C minor, Op. 44, performed by the Boston Symphony Orchestra under the direction of Erich Leinsdorf, released in 2005. The Fifth Symphony, composed in 1944, reflects the grandeur and optimism of the Soviet Union during World War II, while the Third Symphony, composed in 1928 and derived from Prokofiev's opera 'The Fiery Angel', showcases his exploration of darker, more intense themes.