Classical Gas. Playing loud, fast and hard doesn't always mean playing good.
Through the Fire and Flames by DragonForce.
Guitar Hero III: Legends of Rock and Guitar Hero: Smash Hits.
If you mean Bass Guitar I belive the hardest song is: YYZ by RUSH
I'd say the absolute hardest song to sing is "The Queen of the Night Aria" by Mozart. This song goes up to the F above high C and prompts you to be able to go into Flute voice.
Up on the Huvstep
The music was created by Newgrounds member "Snayk". This is the link you can download the song from http://www.newgrounds.com/audio/listen/94726
His concerto no. 3 considered the hardest song in the world by many it is over 40 minutes long.
Fearless and Safe and Sound because they have picking patters, fast strum pattern.
On guitar? Afterlife or Second Heartbeat or Scream
For guitar, I'd say lifeline is the hardest. But for the whole band to play, the Impression that I Get is probably the hardest.
Up on the Huvstep
Necrofantasia is by far a more difficult song to play.
hot for teacher
roxas's theme
It's been awhile since I played, but in my opinion, "Play With Me" is the hardest. I have trouble playing that song on medium!
Well of course, this answer is subjective, since different drummers will find different things harder. For me, The Dance Of Eternity by Dream Theater is the hardest song to play on the drums. Though I'm sure there are some songs I don't know beyond rock and pop that are much harder.
i havent played all the songs but the hardest one i played was seek & destroy by metallica Master of Puppets is probably the hardest song to play on Guitar. maybe that one too
The music was created by Newgrounds member "Snayk". This is the link you can download the song from http://www.newgrounds.com/audio/listen/94726
insane
Through the Fire and Flames by DragonForce.
"The Legend of Max" by ZZ