"Si mi chiamano" Mimi from Puccini's La Boheme.
Mirella Freni and Luciano Pavarotti (who as Mimi's would-be suitor just has to stand around looking sympathetic and only gets to sing one word here: Si).
She is singing about her lonely life in her tiny attic flat. The bit that always gets me is at 2:40 "Ma quando vien lo sgelo..." But when the spring comes, the first rays of sun are mine..."
https://www.youtube.com/watch?v=pPRifoxJtX8