Goodbye Lullaby is the fourth studio album by Canadian singer and songwriter Avril Lavigne. It was released 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 a primarily a pop rock album and is considered a more introspective record from Lavigne in comparison to her previous material, consisting mainly of stripped down instruments such as the piano and acoustic guitar. Lavigne assumed an integral role in the album's production and co-wrote every original track on Goodbye Lullaby, as well as collaborating with several producers including Max Martin, Shellback, Butch Walker, and her ex-husband Deryck Whibley. Goodbye Lullaby is Lavigne's third and final studio album released by RCA, following The Best Damn Thing (2007).