ELI5: Explain Like I'm 5

Extension (music)

"An extension in music is like adding extra toppings to your pizza. Just like you can add pepperoni or mushrooms to make your pizza taste better, musicians can add extra notes to make their music more interesting. These extra notes are called extensions. Think of it like adding sprinkles to your ice cream, it's just a little something extra to make it more enjoyable. Extensions can be added to chords or melodies to create new sounds and flavors that make music sound even better!"