Agent Provocateur is the fifth studio album by American/British rock band Foreigner, released on December 7, 1984. The album was the band's first and only number one album in the UK, and it reached the top 5 in the U.S. Although album sales were lower than their previous work in the U.S., it contains the band's biggest hit single, "I Want to Know What Love Is", which is their only #1 single in the UK and the U.S., staying at the top spot for three and two weeks respectively. The follow-up single, "That Was Yesterday", also proved to be a sizeable hit, peaking at #12 in the U.S. The album was certified Platinum in the UK by the BPI, and triple Platinum in the U.S. by the RIAA.
"That Was Yesterday" was the second single taken from the album Agent Provocateur by the band Foreigner. This song was available in four versions, as a remixed single, a very popular extended remix, an orchestral version, and the original mix. The song was written by Lou Gramm and Mick Jones, and the B-side "Two Different Worlds" is also of note for being the first solo-written Lou Gramm song to appear on a single. The single reached number 12 on the Billboard Hot 100 chart, and also reached #4 on the Billboard Mainstream Rock chart and #24 on the Adult Contemporary chart. It also reached the Top 40 in the UK (#28), the Netherlands (#19), Switzerland (#29) and Germany (#31).
The extended remix added additional lyrics in its intro, and these lyrics can be heard in the live version from the DVD All Access Tonight - 25 - Live In Concert. The video was filmed at the Birmingham Jefferson Civic Center in Birmingham, Alabama.
Allmusic critic Bret Adams called the song "a terrific hit single," citing its "catchy chorus" and "nifty synthesizer lick."