Songfacts®:

• This is the title track of American pop punk band Good Charlotte's fifth studio album. Guitarist Benji Madden explained to Spin magazine why they named the record Cardiology. Said Medden: "Cardiology is the study of the heart, and that's what we spend our lives doing - trying to figure our hearts out. Not just romantically, but with our family, friends, and every emotion we have in our lives. All of the new songs - whether it's the most heartfelt or the funniest party track - are all tied to our emotions."
• Latino artist Daniel Martin Diaz designed and painted the album cover. The Mexican-American previously created the cover of Christian rock band P.O.D.'s 2003 album Payable on Death. Some fans felt the cover was negatively symbolic and many Christian music stores refused to carry the record.
• Benji Madden explained to Spin how he hooked up with Diaz. "He's my favorite artist in the world. He does religion-based pop-surrealism. A lot of people approach him to design album covers, but he hasn't done one in over 10 years. I blindly e-mailed him at the "info" address on his website. I told him that I was in a dark place during our last record, but that in the last two years I fell in love with music all over again. He came down and listened to some rough mixes and agreed to do it. It's my dream come true."