Did the jar just get too full?

Bach and Beethoven lived a long time ago, but you still hear their music. The same for Puccini, Monteverdi, Brahms, Stravinsky, etc., etc. The list of good compositions does not shrink, but keeps on going. Pity the poor "great composer" who comes along today. How do you get your work heard in an ever-increasingly crowded market? And the same no doubt applies to the other art forms. It is tough to compete against all-time greats. Athletes do not have the problem, because Babe Ruth's performances cannot be repeated.