Pantoum of the Opera

Is this one Wagner's Ring?
There's a cycle in it somewhere.
We'll know the show is over
when the Fat Lady sings.

There's a cycle in it somewhere,
and the Nibelungen Ring.
When the Fat Lady sings
we'll drive to Gotterdammerung

down the Nibelungen ring road.
In a Norbert Dentressangle truck
we'll drive to Gotterdammerung.
Valkyries check their Vodafones

in a Norbert Dentressangle truck.
We'll know the show is over when
Valkyries check their Vodafones:
is this tone Wagner's ring?