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 Dear Michael Bednarek 
 Please explain why you can delete the most important lead which explains from its original meanings. The important lead that you deleted unreasonably is below: ""Harmonic is originally an adjective relating to the combination of musical notes to create chords, later, becomes a noun meaning a soft high note played on a stringed instrument by not pressing the string all the way down"". 
 Please explain why you can leave the unsourced OR sentence while unfairly accusing ""unsourced OR"". The sentence in queston that you have left is below: ""usually refers to the frequency components of a time-varying signa"".  
 Please explain why you can express(lie) ""restore"", though in fact you ""ruin""ed the lead apparently. 
 Please explain why you didn't edit positively at all when you are not satisfied with others' edits. 
 Please explain why you cannot think your unreasonable deletings are obviously useless and harmful vandalism against other editors and readers. 
 If you can explain these five questions at once(within 72 hours at the latest), you have proved yourself to be the cruel personal attacker to be banned forever, unfortunately.    "