What is the hardest song in rock band

ROCK BAND:

Guitar: Green Grass and High Tides
Drums: Won't Get Fooled Again by The Who
Bass: Run to the Hills by Iron Maiden
Vocals: Run to the Hills by Iron Maiden

ROCK BAND 2:

Guitar: Painkiller by Judas Priest
Drums: Panic Attack by Dream Theater
Bass: Panic Attack by Dream Theater
Vocals: Tangled Up in Blue by Bob Dylan