This anime merits a score of 9 not because of where it stands in the entirety of the canon, or even in the genre of music-related anime, but just because of how fresh and fun it is. When I was in Japan last summer I saw Tonkatsu DJ Agetarou merch everywhere. Each episode is about 9 minutes, and follows Agetarou's rising career in DJing as he works in his family's Tonkatsu restaurant and seeks to master both skills. It's something of a teaching anime, where you'll learn about the craft if DJing and of tonkatsu if you aren't familiar with already. The energy and vibesare so good, and it doesn't need any added drama to make it engaging. The characters are cute and fun and kind to each other. The representation of "DJ Master Fry" is hilarious. I only wish there was more music to add to what's there.

From my own scoring system:
2/3 for characters and relationships (the focus is not on relationships)
3/3 for content (kind of plot kind of not)
3/3 for formal elements (the show is stylized just right)
1/1 for my special award because everyone is so chill