A piano piece composed in 1980 to celebrate the marriage of the pianist Akemi Satomi (ex Sato) and Kiyoshi Satomi. The fluency with which various textures alternate, and bright and vivid tone colors deriving from the use of modes evoke an atmosphere of happiness implied by the title ‘celebration’. Each of the ten alphabets consisting the couple’s names (A, K, E, M, I, S, T, O, H, Y) was given different textures and placed in the following order: AKEMISATOHKIYOSHISATOMI. In the sections A, K, S, O, rhythms based on Morse code are introduced. Rhythmic variety is created by the codes being the translations of words such as ‘celebration for pf’ (A-1), ‘for akemi and kiyoshi’ (A-2), ‘for satomi and satoh’ (A-3). All these words as well as the alphabets with numbers are written on the score. Variety in rhythm and texture is also found in the sections which are not based on Morse code. I-3, written in almost E major, A-3, evocative of gamelan, and T-2, which exhibits minimalistic traits, all of which appear in the latter half of the piece, are particularly unique. As is often the case with works of Matsudaira, there is no coda, the piece’s end being the same as that of I-4. The score was published by Tokyo Art Service.