- @letters = {'Q' => 220, 'W' => 233, 'E' => 246, 'R' => 261, 'T' => 277, 'Y' => 293, 'U' => 311, 'I' => 329, 'O' => 349, 'P' => 369, 'A' => 391, 'S' => 415, 'D' => 440, 'F' => 466, 'G' => 493, 'H' => 523, 'J' => 554, 'K' => 587, 'L' => 622, 'Z' => 659, 'X' => 698, 'C' => 739, 'V' => 783, 'B' => 830, 'N' => 880, 'M' => 932}
%figure.keyboard
  - @letters.each do |letter, frequence|
    %i(data-key=letter data-note=frequence) #{letter}