Listen to Arcturus Allegro online. Arcturus Allegro is an Instrumental language song and is sung by Jazzical Blue. Arcturus Allegro, from the album ゆったり夜のチルラウンジBGM - Starry Sforzando, was released in the year 2022. The duration of the song is 1:46. Download Instrumental songs online from JioSaavn.