Thalía | Greatest Hits is a compilation album by Mexican pop star Thalía. Released on February 10, 2004, the album features 14 singles from her five previous albums of original material for EMI Latin (it does not include any material from before 1995, nor from her various remake and remix albums), plus two previously unreleased songs "Acción y Reacción" & "Cuando Tu Me Tocas". All of the songs appear in Spanish, including those originally released in English. In April and May 2004, Thalía toured the United States and Mexico on her High Voltage Tour. This marked the first time Thalía toured the US.