In regards to POP ART, Gaga definitely is the most important since Madonna (and could surpass her impact eventually).
The album that changed Pop music today
Did I ****ing lie?
Her outrageous outfits
Amazing, game changing songs and music videos
She writes and co-produces her own songs
Directs/co-directs her own videos
Everything she does is just Iconic
She sings good live
Her performances are iconic and amazing
That hermaphrodite issue will go down in the pop music history Bad Romance song and video defines Pop music
The most amazing pop artist to come out since the 80's