The series has a lot of folk music as well as new age music playing, and all of it is really nice.
- The Opening
by musician Grimes is a short but chilled out piece of electronic music that sounds lovely. - An instrumental portion of Kishi Bashi's "m'Lover" plays during "The Hidden People", giving the audience a cheerful and energetic vibe as Hilda is trekking through the wilderness.
- Frankie Cosmos' "Fool" plays at the end of "The Midnight Giant". As Hilda sadly leaves the Wilderness to Trolberg after her house is destroyed, the song's sad theme reflects Hilda's emotional state.
- In each season, almost all of the episodes end with an amazing adventure/mystery ending theme, known as "Hilda's Theme", tune to close out each chapter of Hilda's story. The credits may not have a background like other cartoons, but the song is a good enough way to remind viewers that there is a big world out there that's still waiting to be explored.
- In "The Eternal Warriors", David listens to a light rock track throughout the episode that is upbeat and empowers him. It also sounds like it came straight from the 80s.
- The music score heard throughout "The Deerfox" is both tear-jerking and heartwarming at the same time, especially if you are a huge fan of emotional rollercoaster episodes. And to top it off, the episode ends with the music beautifully transitioning to "Hilda's Theme".
- Season 2 saw amazing musical performances by Bella Ramsey and Frankie Cosmos:
- "The Life of Hilda", used to promote the 2nd Season and in the credits for "The Beast of Cauldron Island", is a ridiculously sweet song sung from Hilda's voice actress, Bella Ramsey, about Hilda herself and her many adventures and friends. When Chapter 7 ended on a sad note, with Hilda getting grounded, the song plays over the credits to lighten the mood and give viewers a recap of what Hilda and her friends and family had been through so far.
- When Season 2 ended on a cliffhanger, with Hilda becoming a troll, Frankie Cosmos' "The End" plays over the end credits as a way of telling the fans, "All right everyone, CALM DOWN!". It works.
- Basically all the music glory in Hilda and the Mountain King. Where to begin?
- The opening of the film sets the darker and edgier nature of the movie into perspective, conveying Hilda now being separated from her mum and them desperately trying to find their way back with its ominous, foreboding tune and notes.
- During Hilda's emotional breakdown, Pascal Pinon's emotionally powerful "When I Can't Sleep" fits the mood really well, when it seems that all hope is lost...or so they think...
- Ryan Carlson's "Amma's Theme", played during the trolls' reunion with Amma, is just beautiful and is guaranteed to give a tug on the heartstrings.
- It is done. Hilda is back home, is human again, reunited with her friends and family, trolls and human finally begin to make peace, and Hilda is back to her adventuring self once more. How should we celebrate? With Rachel Aggs' "Another Road" of course! This song is the perfect way to wind everything down, and really knows hows to get "Hilda" fans partying.
- Frankie Cosmo's Uncrossed Path is a soft pop song that is played during Season 3, Chapter 8's credits, as the series has reached its end. The song gives off the feeling that while the story has sadly ended, it has reached a happy ending.
