Is the pentatonic scale all the black notes on a piano?
Yes, the blank notes on a piano make up a pentatonic scale, although you can obviously play it in any key – just take out the 4th and 7th notes in any major scale to make the pentatonic. In my opinion, if you play them in a random order it should sound less atonal (not really out of tune, but a bit “clashy” if you were to play two notes together that were just a tone apart) than if you were to press random keys.
