"I just want some freedom, you know?" It's a form of agreement. It's hard to have hobbies, when half of the issue (at least for Tidus) was that they couldn't really move around, go off and just...have space. Even if they had a pool as long as the carriages all were, would it make life any better?

But, they couldn't really do anything about that when their 'kidnapper' was a literal train.

"I'll bet you right now, you learning how to use a mana drive will be easier than you teaching me music." But, he can joke just as easy back. If anything helped the monotony of their situation, it was getting to chat with other people like this.

"But I'm up for the challenge if you are. Knowing how to do a cool guitar solo one day on an electric guitar?" Cue the pretend-play of an invisible guitar. "That'd be awesome!"

...Tidus has very simple ideas about guitars and music.