Give a stream of consciousness and then the final answer. "Lean On" is a song recorded by American electronic music group Major Lazer and French producer DJ Snake featuring vocals from Danish singer M, released as the lead single from Major Lazer's third studio album, Peace Is the Mission, on March 2, 2015. It was produced by Major Lazer and DJ Snake, and written by M, Major Lazer member Diplo, and DJ Snake. It is a dance and electronic song being also described as a house ballad.

Answer this question: who is the girl singing in lean on major lazer?
The important part for answering this question is: "Lean On" is a song recorded by American electronic music group Major Lazer and French producer DJ Snake featuring vocals from Danish singer M, released as the lead single from Major Lazer's third studio album, Peace Is the Mission, on March 2, 2015.
So, the final answer is M.