The hit NBC TV show "The Sing Off" is helping bring acapella music to the mainstream. Pentatonix, winners of the third season, are standing up to the highly-produced music on top 40 radio and are proving that acappella can be really cool and relevant. Here is some more about them and few other acapella jams that you need to check out. 

Pentatonix puts an awesome twist on modern pop songs. Their videos are hugely popular on YouTube and now they are starting to get airplay on the radio stations. They're not the only ones. There are some pretty amazing acapella groups out there you should know. Here are a few I really like.

Watch and listen to Pentatonix' version of Daft Punk's song Get Lucky. Keep in mind, this is all with voice. NO instruments!

Here is another really cool one from an acapella group called Walk Off the Earth. Check this out. 5 voices, one guitar, amazing sound!

Lastly, but definitely not least, here's Kara Della Valle doing Anna Kendrick's song "Cups." Really good!

Do you have any favorite acapella groups, songs or anything you'd like to hear sung acapella? Answer in the comments section of the website below and on our Facebook and Twitter pages using the hashtag #singoff