Music in the manga?

[Storm]

This is a very strange question, but I'm asking for a personal project. At any point, was there a song written in the manga that might have been sung by a character, or a music device, or anything like that? For example, how the One Piece manga has the Sogeking theme song written in it. I don't recall any such instances in the manga, but I'm wondering if I've missed anything. If there's anything, please give it a shout, and preferably what chapter/volume I can find it in. Many thanks!

[Shnuki]

Fortuneteller Baba distracted Yamcha during his fight with that invisible guy by singing. It's in chapter 100.

And in chapter 41, Roshi disguised as Jackie Chun sung a song during his interview.

There's probably more, but that's all I remember.