Funny hack (crossed out) deception of my brain

UPD: pentatonic scale is a musical scale, a certain sequence of heights of sounds (notes), which historically developed and is considered harmonious (thanks to sylvio )
UPD: in Russian it is “pentatonic.” In this video consists of only five fairly stable steps of the usual range: I, II, III, V, VI. It is based on the music that we used to call "eastern" (or "Japanese", "Chinese"), as well as a large number of rock solos, jazz and blues solos. Pentatonic work, if you play the piano on one black key, in a row, starting with pre-sharp (Thanks yaroslavpat , sharpland )