"I Belong to You (Il Ritmo della Passione)" 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 German, peaking at number #1 and becoming the 9th biggest selling song of the year. It also topped the singles charts in, Italy and Switzerland and charted inside the top five in several other countries.