Get ready to spread some serious holiday cheer with this awesome piano tutorial for "Merry Christmas, Happy Holidays" by the one and only NSYNC! This might be a Hard difficulty lesson, but with HDpiano's super clear, visual learning method, you'll be jamming to this festive pop hit in no time – no confusing sheet music needed here. Did you know this catchy tune almost didn't make it onto their album? Justin Timberlake and JC Chasez actually wrote it last-minute, but it quickly became one of the most beloved holiday classics ever!...