"I Believe My Heart" is a song by Blue member Duncan James, sung as a duet with British soprano Keedie Babb. The duet was James' first release as a solo artist around the time when Blue went on hiatus. The song was written by David Zippel (lyrics) and Andrew Lloyd Webber (music) for use in the Andrew Lloyd Webber musical The Woman in White, which premiered the same year. Upon its release, the single debuted and peaked at number two on the UK Singles Chart. Outside the UK, the song reached the top 20 in Italy and also charted in Belgium, Germany, Ireland, and Switzerland.