ELI5: Explain Like I'm 5

I–IV–V–I

Okay, so let's imagine you have four friends called letters. Their names are i, iv, v, and i. These friends love to play music together, and they have a special order in which they like to play their instruments.

First, i friend starts playing their instrument, like the piano. They play a special pattern of notes that sounds good and creates a specific feeling or mood. This pattern is important because it sets the foundation for the music.

Then, iv friend joins in with their instrument, maybe a guitar. They play a different pattern of notes that also sounds good, but it gives a little bit of a different feeling. This pattern adds some flavor to the music and makes it more interesting.

After that, v friend comes in with their instrument, let's say a drum. They play a different pattern of notes that adds even more excitement and energy to the music. It's like a big boom that makes you want to dance or jump around.

Finally, i friend comes back in and plays the same pattern of notes they played at the beginning. This brings everything full circle and gives a sense of completeness to the music.

So, when we say i–iv–v–i, we're talking about this special order in which these friends play their instruments. It's like a musical recipe that many musicians use to create songs that people love to listen to.

And the really cool thing is, this pattern works in different keys too! Just like you can play a game with different colors, you can play this musical pattern with different notes. It's like a secret code that musicians know, and it helps them create all kinds of different songs.