It's VERY hard for me to take a #1 so I'll make a list of cd's I like without things having to be in a particular order.
Nas - Illmatic (good oldskool rap)
Linkin Park - Hybrid Theory (hard music :D)
Manau - Panique Celtique (French band: most people only know La tribu de dana. but I like all their songs).
Nirvana - Nevermind (probably will still be listening when I'm 80)
Eminem - Slim Shady LP (funny and still raw)
Spinvis - Smalfilm (you'd probably have to know Dutch to find it attactive..very very weird lyrics in a poetic way on a sound of whatever sound the guy could find).
Dr Dre - The Chronic 2001 (still Dre. Great tracks, funny and sometimes disturbing skits..don't turn up the volume right before Pauze 4 Porn or your mother/gf or other people will give you a strange look ;) )
Live - The distance to here (Have seen Live, Live and they ROCK!)
Silverchair - Frogstomp (emo-rock..sue me! But also a bit harder now and then)
Evanescence - Fallen (hard gothic-ish rock..I like it.
Just 2 other bands that I just MUST mention: Corvus Corax, Within Temptation.
So that would be my 10 normal favourites although I could spam on.
Oldies that I like: Dire Straits (can't remember their cd title), Bruce Springsteen, Bob Marly, Kate Bush, Simon & Garfunkel, The Dubliners (sue me again) etc.