Singles regularly crept their way up to the top spot for the first few decades of the 'hit parade'.

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The question moving forward will be whether or not Apple can maintain its hit parade against the juggernaut of Samsung.

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They veer between Khmer pop, film noir soundtrack, surf rock and folky, teenybopper hit parade fare, right out of the late '60s.

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Next to join the hit parade could be Mesa Airlines, which says it will file bankruptcy soon if Delta Air Lines terminates a contract that feeds it passengers.

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Today, the hit parade continues.

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The list of top discoveries made with Hubble reads like the hit parade of astronomy: a mysterious new "dark energy" causing the accelerating expansion of the universe, distances to other galaxies, the supermassive black holes at their centers, the age of the universe, planet formation around other stars, searches for signs of extraterrestrial life -- and the list goes on.

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