})[a] is a mixed-media project about classical music produced by Bandai Namco Arts and DeNA.

Takt Op is set in the year 2047, a future world where music cannot be played freely because it attracts monsters called "D2s".

To combat the D2s, the Symphonica International Organization and the Musicarts combine their powers to defend the cities from D2s.

It was later revealed to be a television series produced by MAPPA and Madhouse titled Takt Op.

[5] On April 22, 2022, Crunchyroll announced that the series will receive an English dub, which premiered the following day.

Destiny, illustrated by Kino, began serialization in Media Factory's seinen manga magazine Monthly Comic Alive on August 26, 2022.

Symphony, written by Aya Takaha and illustrated by Ika Nakaya, began serialization on Media Factory's Comic Alive+ manga website on July 27, 2023.

Bara no Dangan (Kuchidzuke) de Utte!, the series follows the first Musicart "Ode to Joy".