"I Belong to You (Il Ritmo della Passione)" (English: "I Belong to You (The Rhythm of Passion)") is a duet by Italian singer Eros Ramazzotti and American singer Anastacia, released as the second single from Ramazzotti's eleventh studio album, Calma apparente (2005), and the third from Anastacia's first greatest hits album, Pieces of a Dream (2005). It was met with commercial success in mainland Europe, particularly Germany, peaking at number one and becoming the ninth-biggest-selling song of 2006. It also topped the singles charts in Italy and Switzerland and peaked within the top five in several other countries.