 The episode featured cover versions of five Spears songs, two of which were performed by Morris. "Stronger", "... Baby One More Time", "Toxic", "I 'm a Slave 4 U", and "Me Against the Music" (featuring Madonna) were covered. "The Only Exception" by Paramore and "Sailing" by Christopher Cross were also performed. All songs except "Sailing" were released as singles, available for download, and all songs except "I'm a Slave 4 U", "... Baby One More Time", and "Sailing" are included on the album Glee: The Music, Volume 4. Both Spears and Paramore's Hayley Williams praised the episode via the social networking website Twitter, approving of the use of their songs. All singles managed to chart on the Billboard Hot 100, selling 406,000 downloads collectively. The cast's cover of "Toxic" charted as the highest of the six, at number sixteen with 109,000 downloads.
