There are at least 3 artists with this name.

1. Nonagon is a three-piece punk rock band that was formed in the early oughts and practices in the Logan Square neighborhood of Chicago. The band is comprised mostly of Tony Aimone (who used to be in The Blue Meanies, Taylor, and The J. Davis Trio), Robert Gomez (who was in der lugomen and is one-oneth of Martian Law), and John Hastie (who used to be in Jumpknuckle). They play loud and abrasive rock with varying time signatures and screamy vocals. They have released two EPs: 2007's "No Sun" and 2012's "People Live Everywhere." They love to play live shows but they’re still never quite sure how to dress for them. http://www.nonagon.us/

2. San Francisco based indie-electronic music project. http://nonagon.net
3. Nonagon are a trip hop trio from Melbourne, Australia. http://www.nonagonmusic.com/ Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.