1. Tonic:
- Tonic refers to the main or central tone of a musical key. It is the "home base" of a key, and it provides a sense of stability and resolution.
- In a major key, the tonic is the first degree of the scale (also known as the keynote or root note). For example, in the key of C major, the tonic is the note C.
- In a minor key, the tonic is also the first degree of the scale, but it is modified by a minor third interval. For example, in the key of A minor, the tonic is the note A, but it has a minor third interval between A and C.
2. Doh:
- Doh is the name given to the first note of the major scale in the solfège system.
- In solfège, each note of the scale is assigned a syllable: do, re, mi, fa, sol, la, ti, do.
- Doh represents the starting point of the scale and is equivalent to the tonic or keynote in a given key.
- While the tonic is a concept that applies to the overall key or tonal center of a piece of music, doh refers specifically to the solfège name for the first scale degree.
In summary, tonic refers to the tonal center or keynote of a musical key, while doh is the solfège name for the first note of a major scale. They are closely related concepts, but they have slightly different meanings and functions in musical theory and practice.