Hidden deep behind,
So that very few eyes will fall
On me, the one who carries
The most important role of all.

How and why, you ask?
Well, I answer with a smile,
It's simply my ability
To reach lower than a mile.

Slow and steady wins the race,
But I can speed as well;
I maintain a steady pulse
Whilst others turn and swell.

I can give you a feeling like no other;
You'll just want to melt.
I provide the depth needed
That mimics no one else.

Whether it's modern or the classics,
I'll grant your every wish.
All I ask is that in return
You won't mistake me for a fish.