Andamento is an Italian musical term used to refer to a fugue subject of above average length.
The fugue subject is derived from the first line of the chorale.
The alto resumes the fugue subject followed by a stretto entry of the soprano in its higher register five beats later.
The work's final section follows, marked by a statement of the first fugue subject, played in unison octaves, fortissimo.
At times, the sounds passed among the six musicians like a fugue subject.
Many of the fugue subjects are rather odd: more like a collection of elemental musical ideas than a coherent theme.
The fugue subject is presented by the unaccompanied violins, which is a feature that returns in the final Amen of the oratorio.
Its first subject is actually a "glosting" of the fugue subject from the opening movement.
There is great rhythmic ingenuity in the fugue subjects, which range from the neo-Bachian to the Impressionistic.
Horns in D are used throughout, and in the fugal finale they even get to play the fugue subject a couple of times.