Wow! Talk about something that takes a lot of work and dedicated rehearsal! Here are a bunch of harmonically talented guys called "Straight No Chaser" that created an incredible Christmas Carol Mashup. Listen to them blast through Christmas carols creating truly amazing hybrids incorporating a vast catalog of Holiday songs that make you go, "How the heck did they come up with that?"

The demand for their DVD is through the roof. Check out this clip and enjoy!