The correct answer to this open question is the following.
A brief outline of keyboard music.
Keyboard music is the type of music that is based on keyboard instruments such as the piano, organ or modern keyboards. Since the very beginning, keyboard music has been important in musical genres in that keyboards allow the musician to play many notes at the same time and in close succession. Since the compositions of virtuosos musicians such as William Byrd or Igor Stravinsky, keyboards have represented an important component in different kinds of music, bands, and orchestras. Technology has produced many advances in musical instruments and specifically on keyboards, allowing the keyboard player and an infinite number of possibilities to improve his pieces of music.
In modern music such as Rock, keyboards represent the "seal" or "trademark" of many classic bands such as Deep Purple, Yes, Emerson Laake and Palmer or Rush.