
It’s definitely true that music does soothe and calm the soul. And singing the lyrics would definitely enlighten yourself. (And in Yuzu’s case, Haru’s songs will always be a comfort for her.) However, that doesn’t mean that she’s confident in her own voice to match the melody.
She’d actually hum along the tune, but singing is something that’s out of her comfort zone. She rarely does that–but if you happen to rarely catch her singing along in Haru’s songs, it’d be a rare sight to see. Her voice might be a bit meek and mellow, but if you’ve manage to boost her confidence, Yuzu would maybe try to sing along with her heart.