Minato is basically always ready to listen to music, so it doesn't occur to him until Ken says it that someone else might not be the same way. It's fine with him, though; he's here for Ken, and part of being a good friend and listening well is not impressing anything upon him.

And he has to admit, it makes sense that he'd had to rely on music so heavily because he'd been alone, himself. It seems so much less important these days. Nostalgic and a coping mechanism, but not vital. Not the only way he gets through another train ride to another town...

So Minato queues up the song he thinks Ken would most benefit from listening to and lets the screen rest there without hitting play. He returns his arm around his shoulders afterwards, though it's not an instinctual move for him. He has to consciously remember to do it. He's almost stiff about it, unfamiliar as it is to him, but he's absorbing Ken's attitude about it and it's slowly getting more natural.

"I think... you're right. I don't need music when I'm not alone. Knowing all of you, I've really learned a lot," he exhales in a wistful sigh. He really does owe them so much, doesn't he? Minato can't fathom not trying to repay that, like he is now. Like he had.