There are more than one artist by this name.
1.) A Swedish dance singer. a.k.a. Petra Marklund
2.) A progressive jazz / rock band from ex-Yugoslavia.
3.) An emo band from the 90's from California.
4.) A Doom/Death Metal band from Sweden
5.) Screamo band from Elkton, Maryland.
6.) A short-lived seventies rock band from Amsterdam, The Netherlands
1.) Petra Linnea Paula Marklund better known as September (born in Stockholm, Sweden on 12 September 1984) is a Swedish dance singer. Read more on Last.fm