8. Deep Purple, 'Child in Time'
Classic rock radio may have reduced Deep Purple's catalog to "Smoke on the Water" and "Hush," but they have an incredibly rich catalog. One of their standout moments is 1970's "Child in Time," a 10-minute epic that showcases frontman Ian Gillan's crazy vocal range. The band has largely ignored it in recent years, probably because their 67-year-old singer can't hit those notes anymore. It's impressive he was ever able to get up there.