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Is there a music-lover on your list of least-liked people? Then get him or her an instrument impossible to tune. A nice big one, say, like a piano. There may not be any such company as TuneMeNot Pianos of Laredo, Texas. But given the availability of old pianos with overstretched strings, we bet you can find one on your own. Or perhaps an accordion in perfect working order would suffice.