The children sing about gathering straw for their part in making bricks. Adobe bricks are made of straw and mud. Kiln bricks are used in building the tower. Kiln bricks are made of clay, sand, and some metal. Straw is not used.
Hamelin ("Hameln" in German) is a town in Germany. They speak of using Guilders to pay the piper and to melt into gold bells. The Guilder was a Dutch coin and was silver.
They speak of melting gold coin to make bells for the town clock. Gold is too soft to make a bell. To coat a bell with gold, would not require thousands of coins.
The children have American, not German names.