Okay kiddo, do you remember when we talked about notes in music? Well, sometimes we put two notes together to make a sound that sounds good to our ears. The distance between these two notes is what we call an interval.
One special interval is called a major fourth. It's like you're counting from 1 to 4 but skipping the number 3. So if you start with the note C, the fourth note up would be F. It sounds happy and gives us a feeling of resolution, kind of like when we finish a puzzle.
Another interval is called a minor fifth. It's like you're counting from 1 to 5 but making the last one just a little bit lower. So if you start with the note C, the fifth note up would be G, but we make it a bit lower to create a minor fifth. It sounds a bit sad or eerie, like in some spooky Halloween music.
So, a major fourth gives us a happy feeling of resolution, while a minor fifth sounds a bit sadder or spookier. Both intervals are important in music and help create different emotions and moods.