For viewers, it doesn't matter if the music was supposedly created by AI or written by musical prodigies. The soundtrack is a point of excellence in Carole & Tuesday and is all in English (especially a surprise, curse-laden tune from the drag queen trio the Mermaid Sisters in a later episode). Artists Nai Br. XX and Celeina Ann provide the singing voices for Carole and Tuesday, respectively, and they do a fantastic job of conveying the longing, loneliness, and heartbreak the girls tend to express through their music. From the first song they sing together, "The Loneliest Girl," to the opening and ending tunes, the harmonization is superb, the lyrics are touching, and the vibe is heartfelt. There isn't one aspect of this series that feels artificial, even though some of the biggest stars in its universe may be.
Beyond its musical leads, Carole & Tuesday also employs the talents of a ridiculous lineup of musicians, including Flying Lotus, Thundercat, Alison Wonderland, and Taku Takahashi of J-pop/rap ensemble m-flo. The star power assembled for the show is outstanding, and with the way quality is exuded from every aspect of Carole & Tuesday, it's safe to say the effort that had to go into putting it together was most certainly not wasted.
One of the biggest delights of the entire show is, undoubtedly, watching the girls refine their music, working on melodies, and figuring out what works best for them as a duo. Seeing the process is a refreshing change of pace from most music shows, where you're watching pop idols who can already sing circles around the "normal" cast members. They're musical equals, imbuing their own personalities in their songs.