FTP, name this composer of "A German Requiem" and a famous "lullaby".
This composer of the "Alto Rhapsody" and "Love-Song Waltzes" expressed his artistic credo in the words, "If we can not compose as beautifully as Mozart and Haydn, let us at least try to compose as purely."  A meticulous worker, he did not complete the first of his four symphonies until age 43. Composer of "Variations on a Theme of Haydn" and the "Four Serious Songs", he is better-known for the "Tragic" and "Academic Festival" Overtures. FTP, name this composer of "A German Requiem" and a famous "lullaby".
This composer of the "Alto Rhapsody" and "Love-Song Waltzes" expressed his artistic credo in the words, "If we can not compose as beautifully as Mozart and Haydn, let us at least try to compose as purely."  
Johannes Brahms