My iPhone 5 sounds off tune! What do I do?

So I was listening to music (with no headphones) and the background such as the piano sounds lightly off tune but still enough to the point where it is unenjoyable to listen to the music… Any ideas on how to fix it?

Added (1). The xylophone ringtone is completely off tune

Added (2). The xylophone ringtone is completely off tune

You need to take the phone in for tune up.

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