Mcs Act Like They Don't Know

Here's a very interesting sample. The track is Mcs Act Like They Don't Know by KRS-One. DJ Premier produced it and it was released in 1995. 

A hit at the time of its release, its source was the arrangements of Yesterdays (written by Otto Harbach and Jerome Kern) by Clifford Brown. The album, Clifford Brown With Strings, was released in 1955, one year before the artist's tragic death.