When the teenage soap opera Rebelde began airing on Televisa in 2004, few people could have imagined that its cast would end up becoming the biggest pop act of the decade. Their effervescent first album—a collection that captures the teen spirit of the times with irrepressible melodic power—is punctuated with hits like the theme song of the show that put them in the spotlight, the romantic and angst-tinged “Sólo Quédate en Silencio,” and the stirring ballad “Sálvame.”