"Cruel to Be Kind" is a 1979 single by Nick Lowe, co-written by Lowe and his former Brinsley Schwarz bandmate Ian Gomm, that peaked at No. 12 in both the UK and U.S. charts that summer. It also peaked at No. 12 in both Canada and New Zealand. In the U.S., where it is one of Lowe's most well-known works, it remains his only single to hit the top 40, whereas in the UK "I Love the Sound of Breaking Glass" remains his biggest hit after reaching No. 7 a year earlier.

Answer this question based on the passage: who sang cruel to be kind in the right measure? Let's have some stream of consciousness first.
To answer the above question, the relevant sentence is: "Cruel to Be Kind" is a 1979 single by Nick Lowe, co-written by Lowe and his former Brinsley Schwarz bandmate Ian Gomm, that peaked at No. 12 in both the UK and U.S. charts that summer. So, the answer is Nick Lowe.