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Jonhy Rotten and Rostropovich are quite different each other .
They have different musical styles, Jonhy Rotten was part of the group sex pistols  a rock-punk band while Rostropovich plays classic music. They don't play the same musical instruments ,different from Jonhy Rotten who play guitars and sing, Rostropovich plays cello.
They came from different countries;Jonhy Rotten is from the UK while Rostropovich is from Russia. They have different ages in contrast from Rostropovich, Jonhy is younger than him.
Although both , Jonhy Rotten and Rostropovich are musicians the have very different styiles.