Anne Hathaway In Les Misérables (2012)
Just see how well she performed "I Dreamed a Dream"! Many people, anticipated the vocally impressive anthem version. Still, they actually got Anne delving into the subtleties and feelings that Fantine would genuinely experience at that precise moment. She's not singing it to hit every note exactly, but it's not a nice tune. She is a broken woman trying to sing while barely managing her emotions.
That whole scene with the girl in #29 made me wince. It was hard to watch, but then so was the whole movie.
This.