The Haydn of the 20th century - Alan Hovhaness

Hovhaness wrote 67 numbered symphonies, far more than most composers. He did not write as many as Hadyn, who wrote over 100, but far more than his contemporaries, for the most part. I do not know his works, so I cannot vouch for their quality. However, I do remember that when I was in college at Arkansas Tech, his compositions were in vogue.