Context is important to me when considering background music. When Link goes to awaken Makar, the Korok is practicing a song. Considering how big of a role music already played in that scene, the song needed to stand out on its own.
And I think it does. The
ocean's theme has a different challenge; especially in the beginning, when you can't do a lot, it's going to be one of the main elements of the scene that people notice, but it also needs to match the mood for when you're exploring. It's also very uplifting and encouraging, which befits Link's personality. It could have been more suspenseful and mysterious for a different game and protagonist, but Link holds (or will hold) the Triforce of Courage. He needs something that indicates bravery and an eagerness to seek out adventure.
The
Hyrule Castle theme is a good contrast. It adds to the atmosphere; it's solemn, mysterious, a bit foreboding even. It's regal, while at the same time I feel a sense of lost history while listening to it. And it has to do all that when actually, it's probably not what catches your attention in that scene - the discovery of Hyrule Castle with all those monsters seemingly frozen in time is what struck me about the scene. The music helps
make the moment, but it's not the focus of it. That, too, is good music.