The first collaboration project of "illustration × music" presented by the creator group "Letter of sounds." In the doujin scene, jacket illustrations are usually created based on the "music." "What would happen if we did the exact opposite?" This project started from such an exciting, reverse idea. Based on the worldview drawn by illustrator Mao, composers have written songs with free imagination, making this a compilation album & artbook to enjoy with both your eyes and ears. The thoughts put into the title "Primo Tono" Primo = "First, primary" Tono = "Tone, pitch" and "shade, hue, colour tone" "Tono" is a word that holds an important meaning in both the contexts of "music" and "painting." We named it this title as the memorable first project where the two arts intersect. How will the worldview felt from a single illustration be expressed and expand through music? Please experience the free and diverse harmony of sounds and colours that is not bound by the framework of genres! Product Specifications Package details: Original music CD + Full-colour illustration booklet Illustration Booklet Specifications: Full-colour / 20 pages / B5 square Release Date: 16 August 2026