As of now, Uta is indeed alive. The story hasn't depicted anything otherwise. Maybe there'll be changes in the future, but for now, Uta's part in the manga continues with them being alive.
Yes. Instrumental music can tell a story. For example, in movie soundtracks, the music often sets the mood and tells the story without words. A fast - paced, intense piece of instrumental music might tell a story of a chase or a battle, while a slow, gentle melody could be about love or peace. Composers use different musical elements like rhythm, melody, and harmony to convey emotions and events, which is like telling a story.
Tanjiro might use his sense of smell to detect hidden threats. Since his sense of smell is super - enhanced, he could sniff out any demons or traps in the way of saving Rengoku. For example, if there are demons disguised as allies, Tanjiro would be able to tell by their scent.
The 'Redemption Song' instrumental version is also great. The melody has a sense of hope and resilience which can mirror the different phases in a life story. It has a slow and steady tempo that gives a feeling of contemplation, much like reflecting on one's life.