in "Let the Music Play", the intro to "Last Night", the entirety of "Interlude: The Fifth Chamber", and a synthesizer throughout "Cardiology". The majority of the music is credited to Benji Madden and co-writers John Feldmann, Gilmore, Joel Madden, Matt Squire and Detail. The Madden brothers wrote most of the lyrics with occasional contributions from Gilmore, Feldmann and Detail. Additional writing was done by Gilmore, Sam Hollander, Dave Katz and Luke Walker. Songs "Introduction to Cardiology" is an a cappella track in the vein of the Beach Boys and consists solely of a line from the title-track. Benji Madden said "Let the Music Play" is similar to "Hold On" from The Young and the Hopeless, which was inspired by comments on a blog post on the group's website in which they said they would re-record the album. "Counting the Days" is a "love letter" to their fans, according to Madden. Madden said "Silver Screen Romance" is "totally the Good Charlotte return to pop-punk"; it features a distorted vocal track in the middle section. The song is about each of the band members' love for something or someone. The dance-rock track "Like It's Her Birthday" is a mix of the group's self-titled and Good Morning Revival albums. Madden said "Last Night" is "almost like the sequel" to "Dance Floor Anthem". "Sex on the Radio" in an attempt to emulate the spirit of the hearing of a woman's voice on a radio. The track reminds Madden of the music of the Cars and Cheap Trick, and is about "all the girls out there who make boys want to start bands and go on tour". "Alive" is the "most straightforward rock" on the album, according to Madden. The Madden brothers wrote "Standing Ovation" about Joel's children and their niece. Benji Madden learned how to play guitar by listening to Oasis; the track is "straight out of the Noel Gallagher handbook". The piano-led track "Harlow's Song (Can't Dream Without You)" was written solely for Joel Madden's daughter Harlow but was included on the album after Benji Madden became emotional after hearing it. Madden made "Interlude: The Fifth Chamber" to give the listener "a musical breather". "1979" is about the happy memories of the Madden brothers' family, mainly their parents. "There She Goes" is about how the realization "things change, but we’re still the same boys no matter how far we go from home". Discussing