ELI5: Explain Like I'm 5

Cantus firmus

Okay, kiddo, so let me tell you about something called "Cantus Firmus". It's a fancy music term that was created a long, long time ago.

Imagine you have a song, but instead of having a bunch of different notes and melodies, you only have one single note that keeps repeating over and over again. That one note is called the "Cantus Firmus". Kind of like a foundation for a building, the cantus firmus is the foundation or base for a song.

Now, the other musical instruments or voices around the cantus firmus note will play different melodies and harmonies to make a full song. They can only play certain notes that fit well with the cantus firmus, but they can make all sorts of different rhythms and sounds.

So, the cantus firmus is like a really important part of a song that helps guide the other instruments and voices to play a good song together. It's like a musical boss that tells everyone what to do!