I would also opt for Beethoven, closely followed Bach and Brahms - regarding the "big B's".
But there are many other great componists (Tchaikovsky, Debussy, Chopin, Vivaldi, Ravel, Mozart, Pachelbel, Verdi, Berlioz, Liszt, .... - it would be too long to list all af them - lol) from the past and from more recent times.