If you're interested in getting into music in general & checking out classics from all genres, this site's top rated albums list is a good start:
Custom chart - Rate Your Music it covers a lot of ground on overall highly acclaimed albums.
Some personal recommendations would be:
Can - Tago Mago, Ege Bamyasi & Future Days
Amon Duul II - Yeti
Flower Travellin' Band - Satori & Made In Japan
Cocteau Twins - Treasure & Heaven Or Las Vegas
Slowdive - Souvlaki
The Flaming Lips - Yoshimi Battles The Pink Robots
Love - Forever Changes
Television - Marquee Moon
The Cure - Pornography & Disintegration
Miles Davis - bytches Brew
Portishead - Dummy & Portishead
Judas Priest - Stained Class & Painkiller
Young Thug - Slime Season
Also there's actually a general music board here called The Lounge, but since it's a subforum under The Booth it isn't as active as it should be.