Tip: start playing SCGMD2 and play it for a couple of minutes, then go play SCGMD3 for a few more until you are enfuriated with the how much faster than SCGMD2's songs SCGMD3's songs are. Then come back to SCGMD2 and you'll see that you'll be much faster and achieve much more! :) it worked with me at least...
 "Super Crazy Guitar Maniac Deluxe 2"){kind=icon}
 "RPG Orgulho Parte 2"){kind=icon}