I think it's a natural tendancy going back to childhood that untrained singers will try to sing like the original vocalist. This is a big part of influence and a kind of hero worship. Like when you emulate a guitarist, drummer, etc. that you admire. If you're lucky, the vocal style you want for yourself will be one that is easy for your voice to recreate. Otherwise you risk battling throat problems without some training. Some people will take a song apart and make it their own but I believe that comes with confidence in your own voice.
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