Beethoven's symphonies are not 'relaxing.' They are the most exciting things that have ever been created by a human being.
Beethoven's fourth and seventh symphonies have a certain amount in common. Well, of course they're both written by Beethoven, but besides that, I would say their overall effect and idea is to provide the listener with an incredible sense of joy.
The symphonies are the things that, as a soloist, I've not gotten to play. I used to travel the world playing concertos, and then I would sit and listen to the symphony.