700,000 copies in the United States. The album was preceded by the lead single "Potential Breakup Song". "Potential Breakup Song" peaked at No. 17 on Billboard's Hot 100, becoming their first top 20 single in the United States. The single was certified Platinum by the RIAA for sales surpassing 1 million copies. In October 2007, both the single and the album were released in the United Kingdom; "Potential Breakup Song" reached a peak position of No. 22 in the United Kingdom and No. 16 in Ireland. Aly & AJ toured for a short while in the UK, opening for McFly twice and performing at several television shows and nightclubs. Time magazine named "Potential Breakup Song" one of the 10 Best Songs of 2007, ranking it at No. 9. Writer Josh Tyrangiel praised the authenticity of its having been written by the teenage sisters who sing it. The track also went to chart solely on digital download in several countries like the Netherlands, Norway and Canada. Insomniatic was critically acclaimed. USA Today stated: "for Insomniatic, the sisters had a hand in writing every song. The single 'Potential Breakup Song' sounds somewhat like Del Shannon's 'Runaway' run through a processor, but there's a lot more going musically than on your average teen-pop album." Fraser McAlpine of BBC Radio stated: "Aly and AJ's previous album was rock-pop; some of it light and bubbly, some of it bordering on heaviness. Staccato, often angry pop but still definitely pop. Their second offering, 'Insomniatic,' with this as the lead single seems to have kept the staccato and the venom but added more layers of pop, to create something that sounds like My Chemical Romance going through a blender with some soft-hearted Angry Girl Music." McAlpine described "Potential Breakup Song" as having "the most danceable mental breakdown I've heard in quite some time." In December 2007, the band replaced the Jonas Brothers as the opening act for Miley Cyrus's Best of Both Worlds Tour. In early January 2008, Aly & AJ performed a cover of KT Tunstall's "Black Horse and the Cherry Tree" on Yahoo's Pepsi Smash video site. The cover, recorded at Abbey Road Studios, was featured on the Japanese re-release of Insomniatic. "Like Whoa" was released as the second single from Insomniatic and reached number 63 on the Billboard Hot 100. Aly & AJ covered the Grand Funk Railroad song "We're an American Band" for