The Riddle
What has keys but can't open locks, and is played when it's time to rock?
Related snips
Riddle
i-have-strings-but-no-fingers-i-can-sing-without-a
i-have-keys-but-open-no-doors-make-music-without-a
what-has-keys-but-cant-open-locks-yet-can-change-the
i-have-keys-but-open-no-locks-i-have-strings-but-i-am
what-has-keys-but-cant-open-locks-and-loves-to-play-yet