electric guitar (acoustic possible for some)-

beginner:

romance d'amour
fur elise - beethoven
smoke on the water - deep purple
come out & play - offspring
good riddance - greenday
wonderful tonight - eric clapton
winds of change - scorpions
summer of 69 - bryan adams
paranoid - black sabbath
she loves you, day tripper - beatles
otherside - red hot chilli peppers
hell song - sum 41

novice:

enter sandman, seek & destroy, nothing else matters - metallica
fear of the dark, the trooper - iron maiden
hotel california - eagles
sweet child o' min - guns n roses
back in black - acdc
hysteria - def leppard
dream on - aerosmith
black magic woman - santana
hey joe - jimi hendrix
highway star - deep purple
zephyr song, can't stop, californication - red hot chilli peppers
losing my religion, imitation of life - rem
all you wanted - michelle branch
you give love a bad name, living on a prayer - bon jovi
through the fire and flames - dragonforce

advanced:

master of puppets, one - metallica
bohemian rhapsody - queen
mr. crowley, crazy train - ozzy osbourne
far beyond the sun, black star - malmsteen
phantom of the opera, rainmaker - iron maiden
flying in a blue dream, crystal planet, summer song - joe satriani
eruption, panama - van halen
stairway to heaven - led zeppelin

some other catchy / popular misc. songs u might wanna learn:

canon rock
beethoven virus
the godfather theme (love theme) - guns n roses
top gun (movie theme) - joe satriani
johnny b goode - chuck berry
lemon tree


there u have it, might have missed a few.. sorry if some songs are a little too 'old school'..