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noun, の adjective
If you follow the law of rotation while you play music you'll end up with a lovely melody. If you don't, you'll miss all the cues on beat that rotation gives you and it will sound like crap.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
I could always hear the melody of a beautiful piano from that house.