Here are both systems used to describe the C Major Scale…
By the way, Do=1, Re=2, Mi=3, Fa=4, So=5, La =6, and Ti =7… always, no matter what key you are in!
Which begs one to ask…
- Why two systems and not just one?
- Which system should I learn?
And the answer is: You should learn both systems, for at least five reasons…
- Both systems are widely-used in music theory to describe, communicate, and analyze musical patterns such as scales, melodies, and chord progressions.
- Neither system is perfect. Each has its pros and cons, capabilities and limitations.
- Both conventions will be used throughout the Piano-ology website as appropriate.
- The Number System is better-suited for describing chord structure (independent of tonality), as you will see when you study chords.
- Solfege is better-suited for analyzing and doing ear training for scales and melodies.