Written by Per Gessle for Roxette, It Must Have Been Love was first released in Sweden in 1987, then re-recorded for the soundtrack of Pretty Woman in 1990, where it became a worldwide number one hit. The shorter chorus clip now circulates online far from the full song, reused in fan edits, wedding throwbacks, breakup compilations and ironic posts about missed chances. Its instantly recognisable melody and final, fading tone have kept it alive as shorthand for a romance that ended too soon.