Jenny Slate (I admit I didn't know who she was) does her version of Marcel the Shell singing Landslide:
https://www.youtube.com/watch?v=_jmAOoIW7YM#t=127
From TheNerdist :
Jenny Slate is a funny, funny person. We all knew this, from her one year on Saturday Night Live to her characters on Kroll Show to playing Mona Lisa Saperstein, aka “The Woooooooooorst.” She’s even proven she can carry an indie film with this year’s Obvious Child, but perhaps her greatest contribution to pop culture (we exaggerate) is as the soft spoken title character from the series of short films co-written and directed by Dean Fleischer-Camp entitled Marcel the Shell with Shoes On, the first of which won awards at film festivals and things.
It seems that Conan O’Brien is also a fan of this character, and of Slate’s vocal performance, because they spent several minutes talking about it during the actress’ appearance on Conan, where Slate unveiled that, on top of motivational messages to herself,
she also uses Marcel’s voice to sing covers of famous songs, including the 1975 song “Landslide” by Fleetwood Mac. Marcel croons a little bit of the song for an impressed and delighted audience. Listen for yourself!