The song is a classic from the Rogers and Hammerstein musical "State Fair." https://www.bing.com/videos/search?view=detail&mid=119B6D58C77FEA3D35D5119B6D58C77FEA3D35D5&q=it's a grand night for singing&shtp=GetUrl&shid=4735f48e-e37d-4158-84f2-5c9c8f0c972f&shtk=SXQncyBBIEdyYW5kIE5pZ2h0IGZvciBTaW5naW5nIC0gU3RhdGUgRmFpciwgMTk0NQ%3D%3D&shdk=RW5qb3kh&shhk=C03C1UQ6ZlRNt4Rx5Q0rwY0elQ1Otx%2F38A7kvqtJmYg%3D&form=VDSHOT&shth=OVP.4NQ5fm2I0h0zpSnVIcfCzQHgFo
The sheet music isn't this song.
The sheet music isn't this song.