What song did Sugarhill Gang sample for the intro part of Rapper's Delight?:

What song did Sugarhill Gang sample, for the intro beginning part of Rapper's Delight.
This is at the beginning of the song, from their fifteen minutes full length song.
(The first fifteen seconds).
I found out that the original sample is not from Love-Deluxe.
Is the original sample, even called Here Comes That Sound Again, but done by a different artist group, that Sugarhill Gang sampled?
What is the name of this song and artist, that Sugarhill Gang sampled, at the beginning of Rapper's Delight?
Looking for the piano bass sample, before it hits off with Good Times by Chic.
It sounds like an instrumental song. I am not 100% sure if it is instrumental or not.
Can anybody name this mysterious tune and artist?

You might be familiar with Night Train by James Brown, if you know this tune.