 In the chorale , " Und was der ewig gültig Gott in seinem Wort versprochen hat " ( And whatever the eternally merciful God has promised with His word ) , the unadorned cantus firmus in the soprano is embedded in a trio of the two oboes d 'amore and the continuo . Gardiner notes that the oboes ' music may illustrate the " stratospheric circling of the angelic host " which the hymn text refers to . 
