I repeat 10 s moments up the wazoo! My most repeated music segment of all time I think is [1] + [2], and have been repeating the first 30 s of This Land from The Lion King a lot today.
As far as John Williams, I remember repeating this countless times when it came out. The bright and airy classicism of it fascinated me, and how it sounded slightly flat:
The horn melody (+ little flutes.) Reminds me of something that would be out of Homeward Bound or a country-themed orchestra, yet has much more European elegance and structure.
This is not part of the score, but man, the 10 s of piano... Classic Williams:
Wow yes, such a brilliant melody. That's probably my favorite version of it.
Is that the part when Hedwig is flying over Hogwarts?