You can still hear their influence so
The Byrds
Whoever came up with The Monkees(love 'em or hate 'em, pre-fab boybands ain't goin' nowhere, they just morph is all)
Over 20 years and youngsters are still bitin' so...
Eurythmics
On the hip-hop tip...
Beastie Boys(yeah it's been over 20 years! Pretty long time for a fad huh?)
The Ramones(inspiration for a movement right?)
Producers count so...
Phil Spector and Nile Rodgers(ya tellin' me Amy Winehouse and Rhianna would be successful without these guys' efforts back in the day?)
Someone who should have been a bigger influence? Barry White(didn't have to get raunchy to get the point across, not like todays R&B singers).
Again, since it's been over 20 years They Might Be Giants and even further back, Frank Zappa(now think about it, both so good that it's insanely tough to rip off either).