Q: Context: "Take That Look Off Your Face" is the title of a hit song by musical theatre composer Andrew Lloyd Webber. Collaborating with lyricist Don Black, it was written for the song cycle show Tell Me on a Sunday in 1978. It was sung and released by Marti Webb in 1980, and became a No. 3 hit in the UK charts. The song was also popular in Ireland, and spent six weeks at number one. Later, Tell Me on a Sunday was combined with another Lloyd Webber work, Variations, to form an entire new show, Song and Dance.

Question: who sang take that look off your face?
Let's give stream of consciousness below
To answer the question, consider the following: It was sung and released by Marti Webb in 1980, and became a No. 3 hit in the UK charts. So the answer is Marti Webb.