I cbf to record myself humming it or something but it's a 2 note melody (with note B being the higher pitched) that goes
A B AAB AABA AB
Edit: I don't know if all the wildly different and incorrect replies are a bit, or if this post really is just that vague, but here it is hummed https://voca.ro/17WHcwM48PVa
That's not it, but the first few notes do line up. There's a few more A's before that final B in All Star though