The famous LULLABY composer is Johannes Brahms, a German composer and pianist of the Romantic period. He composed over 200 works, including symphonies, concerti, chamber music, piano works, and choral compositions. His most famous works include the 'LULLABY' (Wiegenlied), which is one of the most popular pieces of classical music. Brahms was also known for his use of counterpoint, development of complex harmonies, and his exploration of musical form.