The chilli peppers have been amazing records since 1989 with Red Hot Minute and have continually produced legendary albums ever since (Californication, Blood Sugar Sex Magic and Stadium Arcadium par example) and have a live show thatd put mojo into a mummy.
And how could you discuss music in the last 15 years without talking about Dave Grohl. Best friend of legendary Kurt Cobain and drummer for his project Nirvana. Literally WAS the Foo Fighters in its instrumental entirety for the Foo's first CD in 1995. The Foo's have been making great albums to this day with this years "pretender".
producing continual classics and very much moulding the future generations of music. The Foo's with the great Dave Grohl and the Chilli Pepper's all stars of Kiedis, Frusciante and Flea (and that guy that looks like Will Ferrel) has certified themselves as timeless hits and remembered for the best bands of our time.