[Shaun]

90s. Oh lord this could take a while.

Oasis, Pulp, Blur <3
The New Radicals' album is the best of the decade for me, I wish they didn't split after it.
also love:
The Cranberries
Sixpence None The Richer
No Doubt
Madonna's Ray of Light album [and Frozen]
Placebo
U2
Muse
Massive Attack
Marilyn Manson
Robbie Williams
Radiohead
Texas
The Verve

loads more [especially one-hit wonders like Eagle Eye Cherry, Deep Blue Something, Len, etc.]