The first clue to the sound of Avril Lavigne's third CD, The Best Damn Thing, comes in the form of her kickoff single, "Girlfriend," which is filled with singing, clapping, and cheerleader-style chanting. The song is quite a sonic contrast to her previous disc, Under My Skin, which was considered to be Lavigne's more mature follow-up to her 16 million-selling debut CD, Let Go. Like that debut, The Best Damn Thing will be largely and deeply embraced by teenage girls, and is packed with songs that will create enthusiastic sing-alongs in concert. There are a handful of numbers that will appeal to a wider audience; "Innocence" and disc closer "Keep Holding On" would both fit perfectly in a Gray's Anatomy episode, while the sultry message and solid harmonies in "Hot" will appease ears of many ages. Lavigne's husband, Sum 41 frontman Deryk Whibley makes an appearance as producer and instrumentalist on a handful of tracks; their union, however, seems to have bred more than love. "I Don't Have to Try" and "Everything Back But You" both have a frenetic pace and chorus that is so eerily Sum-like that if they weren't married, a copyright lawsuit might ensue. That aside, the record oscillates between lyrically acerbic fare ("One of Those Girls," "I Can Do Better") and fluffy sugar-pop melodies ("Contagious," "The Best Damn Thing") delivering far more spunk rock than punk rock.