When attempting to cover a popular song it’s important to make it your own, while also not going too far from the blueprint (unless that’s the sound you’re going for, of course.) Crowds tend to go wild for something that they are already familiar with, but when you can add your own flavor to it.. you’ve given the listener something to set you apart. Whether you are changing the way certain words are sung, or altering the melody in some way, it is important to maintain your own individuality, especially when covering somebody else’s song.