UNIT B Breaks Down Music Theory Using Its Own Song, Then Performs It Live

HOLOLIVE — UNIT B, the pre-debut music unit, held a roughly two-and-a-half-hour music study session on Thursday built around its own song, Flare Glance. Mira, who handles piano, and Lyra, who handles composition and arrangement, set out to explain how a pop song is put together in terms anyone could follow.

They opened with the basics: music rests on melody, harmony and rhythm. They then covered how most of a song’s notes come from a scale of seven tones, how a major key tends to sound bright and a minor key darker, and how a chord is simply several notes sounded together. Taking questions from Mira, Lyra explained that a capital letter in a chord symbol names the lowest note, and that the gap between notes changes a chord’s color. She also described how an added seventh or sixth shifts the feel of a chord and played the song’s chorus on piano, describing it as built on a 4-5-3-6 progression.

“Little by little is fine. If you keep going little by little, it keeps widening.” — One of the two, on learning chords

Later segments covered the roles of vocals, guitar, piano, bass and drums, and how swapping chords can change a melody’s mood. Playing a five-to-one chord change, the pair said it made the music sound as though it had ended, and chat joked that the song had been shut down. Their advice for learners was to analyze favorite songs, copy them by ear and put in volume, and one of them said she had learned by writing chords out and playing them back.

The sing-along followed. After sorting out a sound-delay problem on the spot, Lyra sang Flare Glance to Mira’s piano. They restarted once after a lyric slip, then played the song through again. Lyra called performing together more fun than going it alone, and Mira thanked her in return. Chat answered with long runs of clapping and penlight emotes.

The pair then moved to snack time, with cheesecake and waffles on the table. Mira played piano while they chatted, including a Liszt piece that chat identified, and the two went on to try playing along to a song by ear. Near the close, Mira said she would be streaming Minecraft at 18:00 and that Lyra was expected to drop in.