How to get better quality on YouTube

So basically add &fmt=18 to the end of a video's URL and hit enter. Then you got better quality. I noticed on some videos the quality doesn't get a whole lot better or some not at all. But on alot, they do. Test it out with some videos, see how it works. This song is New Design by Thousand Foot Krutch and now as always DISCLAIMER: I DO NOT OWN THIS SONG OR THOUSAND FOOT KRUTCH, I USED IT IN THIS VIDEO FOR ENTERTAINMENT PURPOSES ONLY. I MEAN NO OFFE

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