Beautiful Sunday is a hit song by Daniel Boone that first appeared on his 1972 album Beautiful Sunday. It's very well-known in Japan, perhaps because it was used as the theme song for the 1975–1976 TBS show Ohayo 720. It's one of those songs that always puts you in a good mood!
Ritsuka gives a brilliant performance. She's playing the melody, accompanied by her teacher Giovanni. Enjoy!
Great job, Ritsuka!