I'm having the same exact problem as CMack on 30 lives. I get all marvelous until the last note and no matter how hard i try i can never get better than 'Good'. It is annoying me greatly because this is preventing me from moving on in quest mode and i've been at this for weeks now. I've even tried using a xbox 360 controller. Any other tips?

Update: After hours of trying I finally got it down.... but of course what is happening to CMack is yet again happening to me. I hit all the notes I even manage to get marvelous on the last note, but it gives me a 'boo' right in the middle of the hold. I'm been trying repeatedly and get the same results even with a controller. I'm incredibly fustrated and don't know what to do. I really want to unlock the other songs, but it seems impossible. =(

To Layos: Yes, it makes you play on Expert and the only mod is stealth arrows.