I'm assuming you're looking for information on downloading a specific ISO file for Guitar Hero: On Tour - Decades (often mistakenly referred to in queries as "Guitar Hero Extreme vol 2"). However, it's crucial to approach such topics with a focus on legality and safety.
To play a custom ISO on a real console, you’ll need a way to bypass region locks: download top iso guitar hero extreme vol 2
Guitar Hero Extreme Vol. 2 is a "custom" or "hack" of the original Guitar Hero II engine. Instead of the standard setlist, it replaces almost every song with high-energy tracks from genres like power metal, speed metal, and J-Rock. I'm assuming you're looking for information on downloading