The 2nd line repeats the 1st line with the exact same words plus a conclusion.
Climactic parallelism combines synonymous and formal parallelism. The B-
part of the A-
Ascribe to the Lord, O Sons of the mighty,
Ascribe to the Lord, [O sons of the might] glory and strength.
The floods have lifted up, O Lord,
The floods have lifted up [O Lord] their voice,
The floods lift up their pounding waves.
Sing to the Lord a new song;
Sing to the Lord, all the earth.
Sing to the Lord, bless His name;
[all of the above is a direct quote from Module 7, BE 101, Parallelism Notes, 3]