With a guitar in one paw and a mic in the other, catching this mouse will earn you one of the most face-melting rock experiences ever!! Lore warns that listening to this mouse play guitar could cause your ears to melt off and your head to explode in an awesome frenzy of excitment! "But I like R&B" you say? No! You have to listen to ROCK MUSIC. Haha, just kidding, you can listen to anything you want! ROCK ON! *wailing guitars*
Taken from MHwiki.hitgrab.com
Please note that you cannot catch Rockstar mouse with any other cheese other than Rockforth or at any other place other than Town of Gnawnia, Town of Digby or SSH.
Catch a Gold / Diamond / Nibbler at Ronza's Traveling Shoppe to get Rockforth cheese !