It's not often that the pop charts will surprise you. After all, the average consumer in most countries doesn't have time to delve too deep into an artist's catalogue. They don't often pick up on songs that will stand the test of time. They like the ephemera record labels tell them is hot right now.
Nevertheless, every once in a while something will top the charts that doesn't make sense. We're seeing it happen now with "Gangnam Style", and this past week marks 38 years since Mike Oldfield topped the UK Album charts with Tubular Bells, a 48 minute long instrumental classically inspired progressive-rock album. An edited down single even managed to hit No. 7 on the U.S. Billboard Hot 100 chart after being used as the title theme for The Exorcist.
That sounds weird, but what other strangeness has occurred on the charts? For the purposes of this list, we'll stick to the U.S., since covering the entire world would just fill this list with the weird bands topping the charts in Norway (where, oddly enough, "Gangnam Style" is currently the No. 1 song).