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It just goes to show how English is an evolving language, and, if enough people make the same mistake, it becomes accepted as correct. 'Crescendo' means, literally 'growing' or 'increasing'. As a musical term, it means gradually getting louder, the opposite of 'diminuendo'. Some dictionaries seem to have accepted its misuse, as with the 'incorrect' pronunciation of 'dissect'.
Dictionaries are observatories, not conservatories, I know, so why don't they accept 'seperate' and 'suprise', and why don't they admit that 'lay' is used to mean the same as 'lie', i.e an intransitive verb, by 99% of people.