Goodbye Lullaby is the fourth studio album by Canadian singer-songwriter Avril Lavigne, released worldwide on 2 March 2011 through RCA Records. Recording sessions for the album began in November 2008 and continued over a period of nearly two years, concluding in October 2010. Goodbye Lullaby is primarily a pop rock and pop album, more introspective than Lavigne's previous material. It consists mainly of stripped down instruments such as the piano and acoustic guitar.