here's a list of albums you might want to get if you want get an excellent sampling of punk albums:
X- Los Angeles
the Ramones - the Ramones
the Clash - the Clash
Sex Pistols - the Great Rock n Roll Swindle
Buzzcocks - Singles Going Steady
Bad Brains - Bad Brains
Rancid - Out Came the Wolves
Dead Kennedys - Fresh Fruit For Rotting Vegetables
Green Day - Dookie
Here's a list of some albums that should make any metal maniac's collection:
Metallica - Master of Puppets
Rage against the Machine - Rage Against the Machine
AC/DC - Back In Black
Tool - Lateralus
Pantera - Vulgar Display of Power
Guns N Roses - Apetitie for destruction
Van Halen - Van Halen
System of A Down - Toxicity
Iron Maiden - the Number of the Beast
Deftones - White Pony
Slipknot - Slipknot
Led Zep III
Nine Inch Nails - the Downward Spiral
A Perfect Circle - Mer De Noms
If you're looking for alternative titles, then you might want to look for any of these:
Fugazi - 13 Songs
Pavement - Slanted and Enchanted
Nirvana - Nevermind
Hole - Live Through This
Red Hot Chili Peppers - Bloodsugarsexmagik
Oasis - (What's the Story) Morning Glory
Radiohead - OK Computer
Sleater-Kinney - Dig Me Out
Peral Jam - Ten
Smashing Pumpkins - Siamese Dream
R.E.M. - Murmur
the Pixies - Death To the Pixies
watch out for my chillout, hiphop, new wave and pop rock recos.
have fun.