I like the big variety of music and how it changes from season to season and from White to Black (like the Opelucid City’s music: in White it’s touching, while in Black is dynamic). The music became finer than in the previous generations, touching and sensitive like the “Emotion” (made me want to cry) and N's Farewell theme. The music displays many different instruments and styles and tries to match the person’s/town’s/route’s/etc’s personality, main characteristics. So some are dynamic, other creepy, some troublesome and there are also the touching, peaceful one’s.
N’s theme is usually creepy, like his battle theme(but the theme of the last battle adds a nice requiem) and the music that plays when he approaches you. The music on N's Castle Bridge and in N’s Castle have a nice antithesis: the first is happy and hopeful, while the second is sad and depressing. And the music in N’s Room is creepy too.
Ghetsis Battle theme: it’s nice, dynamic, and dangerous. It suits him. I love the drums. Then it goes to creepy with all these voices.
The Team Plasma’s Battle theme annoys me as does the Rival’s battle theme. The Gym Leader’s theme, though, when they are with their last Pokémon, it’s nice to hear, especially when the Gym Leader is difficult to beat.
Nimbasa City’s theme reminds me of the music in Pokémon Ranger Guardian Signs when you ride one of the three Legendary dogs, while Accumula Town’s slightly that of a Pokémon Center
The Village Bridge has a folk-like theme with the singing (no wonder it’s called “Village Bridge”), while Meloetta's Song has is New Age style. And the Illusion Forest’s music is worthy of Zoroark.