ELI5, why are the musical notes represented by letters in some places (C-D-E-F-G-A-B), but in others by their sound (do-re-mi-fa-sol-la-si-do) ?

Question

I’m from Mexico and the way I learned the musical notes was by their sound, however some friends from other places learned the notes with letters.

In: Other

Answer 1

The do re mi method (solfége) is for teaching pitches for people who haven’t much music education. As the student grasps more and more theory they move on from the solfége to actual note names and locations on the staff.