Lovelines commemorated the duo's 20-year association with A&M Records, though Karen had passed away six years before.
Ten of the 12 tracks were recorded for other albums but were not included for various reasons; two are remixes of previously released material.
Richard penned the liner notes, which give some insight into the history of the pieces.
"When I Fall in Love" brings a tear to the eye as it captures that indefinable and completely unique quality that Karen brought to each song she sang.
While the material in this compilation is not sensational or ground-breaking, it is definitely a sentimental selection of tunes that go easy on the ear.