"The Sound of Glory"...SACD...Mormon Tabernacle Choir. Several hundred voices, orchestra, monster organ. This can never sound too loud.
Sousa marches also sound good loud.
On the other hand, I sometimes find myself playing music like a violin concerto too loud. The total SPL is not too loud, but I suddenly realize that, because of the way the recording has been mixed, the solo violin is louder than any real violin can play.