"Where Does My Heart Beat Now" was the most successful single from Unison album and became Dion's first English-language hit. In 2008, it was included on the North American version of My Love: Essential Collection greatest hits. The song reached number 4 on the U.S. Billboard Hot 100 and Dion became the first French-Canadian artist to land a top ten hit there. She did even better on Hot Adult Contemporary Tracks peaking at number 2. "Where Does My Heart Beat Now" reached also top 10 in Norway and Canada, peaking at numbers 4 and 6 respectively. After being released in the United Kingdom in March 1991, the song peaked at number 81. However, in March 1993 the single reached number 72.
In 1992, "Where Does My Heart Beat Now" received an ASCAP Pop Award as one of the most performed songs in the U.S.
Three versions of the music video exists: black-and-white Canadian version for the Canadian market (1990), color performance version for the U.S. promotion (November 1990) directed by David Phillips and black-and-white version mixed with performance version made for the Unison home video (1991).