The rhythmic/cantabile contrasting themes is one the usual classical forms. Maybe it was invented by LvB and most pronounced in his 5th.
This piece is based on two such themes completing each other. But not only, there is also a separating theme which inevitable converts into a walz, creating a contrasting rhythm.
In the beginning, playing the first theme, you may here influences from Bach´s peace Air, one of my favourites. And in the end I have borrowed a few measures from the famous rhythmic Finlandia theme. After all, he is my countryman.
Played back by NotePerformer.
Hope to hear from you