Let's just take Alice in Chains, Blind Melon and The Smashing Pumpkins... Who thought, right? A Zombified Grunge back to kick some, well, ass.
Is that all? Or is this a new trend? And if it is, what's the motivation behind it? I think music portals that track the music played on our players -like last.fm- have a vast influence on it. Suddenly disbanded bands see that there are so many faithful listeners around and they're surprisingly still among the top xxx listened bands. (See last.fm's global charts: Alice in Chains @ #211, The Smashing Pumpkins @ #34!)
This also opened the eyes of record labels and concert agencies, too. Profit bells! I think some artists receive pressure from that side, too. Imagine Rage Against the Machine is giving concerts this year. In the same year Zack De La Rocha will come with a solo debut.
other surprises include:
(i'll add names as soon as i know more)