Listen to 7 Motets for Unaccompanied Chorus: No. 1. Graduale - "Os Justi" online. 7 Motets for Unaccompanied Chorus: No. 1. Graduale - "Os Justi" is an English language song and is sung by The Netherlands Chamber Choir. 7 Motets for Unaccompanied Chorus: No. 1. Graduale - "Os Justi", from the album Seven Motets, Geistliche Gesaenge, was released in the year 2002. The duration of the song is 4:21. Download English songs online from JioSaavn.