451. The 5th Dimension
Although their songs were somewhat consistent, the 5th Dimension has been categorized as everything from Psychedelic, Adult Contemporary, Sunshine Pop and Soul. As diverse as those styles may be, all those designations seem accurate. With rich harmonies and a monster hit “Age of Aquarius/Let the Sunshine In” that helped define an era, the 5th Dimension may have done enough to at least get a look from the Hall.