"Black Star" is a song recorded by Avril Lavigne for her fourth studio album, Goodbye Lullaby. The song was written solely by Lavigne and produced by her ex-husband, Deryck Whibley. It was originally written as a jingle in order to promote Lavigne's first fragrance, Black Star, and was to be used in the commercial for the fragrance. It was later expanded into a full song, lasting for a total of one minute and thirty-four seconds, and was used as the intro for Goodbye Lullaby. Lavigne revealed in an interview with Elle Canada that "Black Star" was being considered as a single from the album, although it was never released.
"Black Star" was written solely by Lavigne in between tour stops in a Malaysian hotel during The Best Damn Tour. It was originally written as a jingle intended to be used in promotion of Lavigne's Black Star fragrance, however it was later expanded into a full track in addition to being used in the commercial for Black Star. It was included on Lavigne's fourth studio album, Goodbye Lullaby, as the album's opening track, although it was used as an intro, with the first full-length track included on the album being the second track, "What the Hell".
In an interview with Billboard, Lavigne confirmed that "Black Star" was the first track that she recorded for the album, adding, "A lot of people like it. It's kind of like a lullaby." Due to this comment, it has been speculated that Lavigne titled Goodbye Lullaby based on the album's opening and closing tracks — the album opens with a track Lavigne herself called a "lullaby", and closes with a track titled "Goodbye". While it has not been confirmed whether or not "Black Star" helped inspire the album title, it was confirmed that "Goodbye" was the primary inspiration for the album title.
Lavigne revealed in an interview with Elle Canada that at one point, she considered releasing "Black Star" as a single, stating that her friends had the same reaction listening to "Black Star" that they had had listening to "Girlfriend".
In 2011 and 2012, Lavigne toured in promotion of the album on the Black Star Tour, which was named after the song.
Matt Diehl of Rolling Stone called it "one of Lavigne’s most ambitious songs, an ethereal lullaby that turns epic with tinkling Coldplay-like pianos and soaring strings." Dan Weiss of Village Voice, however, criticized the track for its length.