A long dense snake that makes me boil,
The denser it is, the worse for all.
It has no skin, nor scales, nor coil.
But it moves along, speed down to a crawl.

It has many voices.
A rhythm, but no heart.
You'll know when you see one;
You might even take part.

Escape from its clutches
can bring you some ease.
Now you'll get where you're going
as fast as you please.

What is it?