Whole-tone scale

A whole-tone scale is like a special kind of musical ladder. Most ladders have steps that go up by one, but in a whole-tone ladder, every step goes up by two. It's a bit like skipping every other step on a normal ladder.

So, instead of playing the regular notes on a piano (like A, B, C, D, E, F, and G), you only play the notes that are a whole-tone apart. That means you would play A, then skip B, and play C-sharp, then skip D, and play E-flat, and so on.

The whole-tone scale gives a unique, dreamy sound that is used in lots of different kinds of music to create a certain feeling. Some famous pieces of music that use the whole-tone scale include parts of Debussy’s "Clair de Lune" and Ravel's "Bolero".