Summer Day is a song performed by the English singer-songwriter Tom Odell. It was written and produced by Tom Odell, and also produced by Ben Baptie. It was uploaded to YouTube on 5th April 2019 and officially released on the 19th April 2019 as part of the Moominvalley (Official Soundtrack).
Summer Day is featured in the first episode of the 2019 Moominvalley television series: Little My Moves In, during a scene where Moomintroll, Moominmamma and Moominpappa are trying to convince Mymble that it is the Summer instead of Spring. It begins as background music, then is played in the episode on Moominpappa's radio.