natural horn (Co) enforcing the soprano in the hymn tune, two oboes d'amore (Oa), two violins (Vl), viola (Va) and basso continuo. The title page of the autograph score reads: "Dom: 25 post Trinit. / Du Friede Fürst Herr Jesu / Christ ect. / à / 4 Voc: / Tromba / 2 Hautb: d'Amour / 2 Violini / viola / con / Continuo / di / Sign: / J.S.Bach". In the following table of the movements, the scoring follows the Neue Bach-Ausgabe. The keys and time signatures are taken from Alfred Dürr, using the symbol for common time (4/4). The continuo, playing throughout, is not shown. Movements 1 The opening chorus, "" (You Prince of Peace, Lord Jesus Christ), is a chorale fantasia, the soprano singing the cantus firmus, supported by the horn. The composer of the tune is not known. It appeared in a hymnal by Bartholomäus Gesius in 1601, and is similar to "Innsbruck, ich muß dich lassen". The melody is embedded in an orchestral concerto with ritornellos and interludes, dominated by the concertante solo violin. The treatment of the lower voices is varied within the movement. In lines 1 and 2 and the final 7 they are set in homophonic block chords. The Bach scholar Klaus Hofmann notes that the salutation "Du Friedefürst, Herr Jesu Christ, wahr' Mensch und wahrer Gott" (You prince of peace, Lord Jesus Christ, true man and true God) thus receives weight. In lines 3 and 4 the lower voices begin in vivid imitation before the entrance of the cantus firmus. In lines 5 and 6 their faster movement contrasts to the melody. 2 The alto aria, "" (Alas, the agony is unspeakable), is accompanied by an oboe d'amore as an equal partner, expressing the soul's terror imagining the judgement. Hofmann notes that "Bach has captured the expression of deep sadness in the music with all the tools of his trade: sighing figures, suspensions and augmented, diminished or chromatic melodic intervals: the harmony is full of dissonances." 3 The recitative for tenor, "" (Yet consider, o Jesus), begins as a secco recitative, but the idea "" (Yet consider, o Jesus, that you are still called a Prince of Peace!), close to the theme of the cantata, is accompanied by a quote of the chorale tune in the continuo. 4 Rare in Bach's cantatas, three voices sing a trio. In the text "" (Ah,