Pentatonic Scale	Theory Things   William Wieland
Strictly speaking, a pentatonic scale is simply a 5 tone scale. However, a pentatonic scale usually refers to a major pentatonic scale; 1 – 2 – 3 — 5 – 6 — (8) of a major scale or do – re – mi — sol – la — (do)
To create a pentatonic scale, simply remove the 4th and 7th notes of a Major Scale.

C major scale		C pentatonic scale (C major pentatonic scale)
E flat major scale		E flat pentatonic scale
A major scale		A pentatonic scale
Bobby McFerrin Demonstrates the Power of the Pentatonic Scale
The black keys on the piano are an F sharp (or G flat) major pentatonic scale. Piano Pages:  Pentatonic Playing by Ear   Pentatonic Improvising