Since Alrik suggested Haydn - although I'm mostly into rock, I have a collection classical music as well. Mainly from the 20th century.

Here's Glagolitic Mass, part 2 and part 3, composed by Janacek in 1926.

pibbur who observes that said piece of music is over some time after the fat lady stops singing, since the only soloist in the final parts 7 and 8 is the organ.