You actually can't do that on youtube it still gets copyright claimed.
Please only use royalty free music or make your own or just don't use music.
Just out of curiosity how much of a stickly stickler is the youtube these days? Like if you hum a tune, or sing it but get all the words wrong does the algoman come knocking on your door or do you have to pretty clearly be trying to rip someone off? Seems like you'd be someone who knows this on account of working in youtubistan and all.