The vocalist for the song 'To Sir, With Love' is LULU, a four-letter word. LULU is a Scottish singer-songwriter who was born Marie McDonald McLaughlin Lawrie in 1948. She is best known for her hit single 'To Sir, With Love', which was released in 1967 and reached number one on the US Billboard Hot 100 chart. The song was featured in the 1967 British drama film of the same name, starring Sidney Poitier. LULU has had a successful career spanning over five decades, with numerous awards and accolades to her name.