This 15 point achievement on Xbox 360 seems challenging at first. However there is a way to achieve this the easy way, and that's to beat it on Easy Mode. There are two songs that have 500 notes in it on Easy, "Number of the Beast" by Iron Maiden and "One" by Metallica. So strap on your plastic guitar and let it rip to get this achievement. If you can get this achievement with one of these songs on easy, your more than ready to start your career on Medium.