The summer house theme song is called "Daydream Believer" and was made popular by the band The Monkees in 1967.
The song is an upbeat tune, and its lyrics talk about the joy of believing in the beauty of the world and staying positive even in hard times. It is one of the most popular songs from the 60s and has been used in various films and television shows over the years.
The lyrics of the song are as follows:
“Cheer up sleepy Jean
Oh, what can it mean
To a daydream believer
And a homecoming queen
Oh, Oh, Oh, Oh, Oh
You once thought of me
As a white knight on a steed
Now you know how happy I can be
Oh, oh, oh, oh
Daydream believer
And a homecoming queen
I could never find a way
To make them understand
So I wound up, like a bridge that was burned
Oh, oh, oh, oh
Daydream believer
And a homecoming queen
Cheer up sleepy Jean
Oh, what can it mean
To a daydream believer
And a homecoming queen”
If you're interested in listening to the song, you can check it out on YouTube here: https://www.youtube.com/watch?v=sv3uFe6IwHo
Hope this helps!