She was a bridge between the more 'serious' female pop/rock singers appealing to older audiences (i.e. Alanis Morissette) and the female pop stars appealing to teenagers (Britney/Xtina etc).
Kelly and Pink are good, Kelly especially, but they have nothing on Avril.
You mean the M!ssundaztood era?
History will show a dark time in our culture in which a million followers on Twitter became a key component to winning a Grammy. But thank God for Pink. While Christina Aguilera has a tendency to oversing, Britney Spears can't sing, and Lauryn Hill sorta stopped singing, Pink has managed to carve a brilliant 13-year-career by being something that is incredibly rare these days -- an artist. A complete artist. - CNN