"(You Don't Know) How Glad I Am" is a song written by Jimmy Williams and Larry Harrison. Its best-known recorded version is by Nancy Wilson, which was a hit single in the summer of 1964, when it reached number 11 in the USA. In April of 1965 "...How Glad I Am" received the Grammy Award for Best Rhythm & Blues Recording: Wilson was reportedly surprised by the categorization of "...How Glad I Am" as R&B as she considered the track to be a pop record.
Kiki Dee recorded "(You Don't Know) How Glad I Am" in 1964 with an arrangement - by Les Reed - based on the Nancy Wilson recording: Dee then remade the song as "How Glad I Am" in 1975 with an uptempo bluesy arrangement, and this version - produced by Gus Dudgeon and credited to the Kiki Dee Band - was issued that spring as the follow-up to "I've Got the Music in Me" reaching number 33 UK and number 74 US. The Kiki Dee band version also charted in the Netherlands (number 16) and Flemish Belgium (number 30)