"I Won't Last a Day Without You" is most famously a hit song by , originally released on their June 1972 album A Song for You . Written by the renowned songwriting duo Paul Williams (lyrics) and Roger Nichols (music), the track is celebrated as a quintessential 1970s love ballad. Notable Features and Versions

: The song reached No. 11 on the Billboard Hot 100 and hit No. 1 on the Adult Contemporary (Easy Listening) chart.

: For its 1974 single release, Richard Carpenter remixed the 1972 original by slightly speeding it up and adding guitar riffs performed by Tony Peluso .

: A specific version (found on the 2000 compilation) features an added piano piece that modulates the key down to segue into their hit "(They Long to Be) Close to You".