Well, Avril was here for 10 years so her.

Well EYE said Ke$ha, since Tik Tok changed the sound of radio.

Not that she's influenced another person, though.

Avril. Her 1st album was HUGE and made pop-rock the trend for years.

Avril.

Avril>>Alicia Keys first single>>>Katy=Kesha

Obviously Avril.

Katy>Avril>Kesha

Avril > > > > > > > > > > > > > > > > > > > > > Ke$ha > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Katy

Avril

avril is the only one who has been around long enough to even have an influence on music

Alicia Keys 1st single > Avril > the rest

Avril influenced people back to her debut.

Avril

No one.

Jessie J is basically Katy 2.0 so...

Katy Perry.

I think there are going to be more 'Domino's in the future. And i think she's the main reason why many other artists are using Dr. Luke today (Rihanna, Jessie J, Nicki Minaj, Marina and the Diamonds).

I can't think of any artist who copies Avril Lavigne tbh.