who sang let it go in frozen
âDemi Lovato.  Let It Go  is a song from Disney 's 2013 animated feature film Frozen, with music and lyrics composed by Kristen Anderson-Lopez and Robert Lopez. The song was performed in the film by American actress and singer Idina Menzel in her role as Queen Elsa.rivia.  1 Let It Go is the first solo sung by a Disney Princess who is the deuteragonist of the film. 2  Although Jasmine did have a solo in Aladdin, it was cut. 3  The song won the Academy Award for Best Original Song, being the first one from a Walt Disney Animation Studios-produced film in 14 years to win it.