Some notes, and for that matter chords, go together better than others. Take the note C and then play an F and then play C to G. The F is the fourth note of the C scale and C to F is called a perfect fourth because these notes go so well together. You don't get a perfect second because these notes don't fit together as nicely. However C goes well with G and this is called the perfect fifth.
It doesn't matter if we are talking about individual notes or with full chords, C, F and G go really well together. There are many songs that just use those three chords because they fit together so well. It doesn't have to start with a C chord. If you start with a D then the fourth is a G and the fifth an A, and there are many songs in those three chords too.
If you take the notes and go from C to F then back to C then G this is exactly the melody of the Intel theme commonly heard on adverts. You can't get much simpler than a perfect fourth and a perfect fifth. OK the Intel advert has the notes C, C, F, C and G (or whichever key they are in) but someone has made a lot of money out of that. Maybe that's why they are called perfect intervals.
Aloha
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