Symphony No. 1 is a classical music composition by Gustav Mahler, completed in 1888. It is often referred to as the "Titan" symphony and is known for its grand scale and emotional depth. The work consists of five movements, showcasing a range of themes from nature to human experience. The symphony features a variety of instruments, including strings, woodwinds, brass, and percussion, creating a rich and dynamic sound. Mahler's innovative use of orchestration and thematic development has made this symphony a significant piece in the symphonic repertoire, often performed in concert halls around the world.