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Here's Larry Hooper from The Lawrence Welk Show singing "Oh Happy Day".
Why am I linking to this? Well, two reasons. For one thing, let's marvel at the incredibly DEEP voice of Larry Hooper. Seriously, the cat could give Tony the Tiger a run for his money. When this aired, in 1977, Hooper had just recovered from an illness - so he's not 100%... but still quite impressive.
My second reason for linking to this involves a prank played by Howie Mandel before his live comedy shows. He plays the clip of Hooper singing "Oh Happy Day" on an endless loop; it usually takes audiences about five-six minutes to realize what's going on. After ten minutes they're yelling at the screen. After twenty minutes, they're pulling their hair out.
Someone simulated a ten minute version here, now imagine sitting through a version twice as long.