Riddle: I have keys but open no doors, make music without a…

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i-have-strings-but-im-not-a-puppet-i-have-keys-but-im

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what-has-keys-but-cant-open-locks

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i-can-be-grand-yet-fit-in-your-hand-what-am-i

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what-has-keys-but-cant-open-locks-yet-can-change-the

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i-have-keys-but-open-no-locks-i-have-strings-but-i-am