The "add" function means in addition to what is already there. Since the 3rd is MISSING there is less opportunity for dissonance, although some will be present due to a Major second. In its place meaning in the same voice where the 3rd would be. that note that defines the major or minor character of the chord and either a 2 or 4 is in its place. The historical convention is that a sus chord is MISSING the 3rd, i.e. The add chords mean just that, you "add" an extra note. The point is that "sus" has a very specific meaning. ![]() In this case your suspension would be of the 2nd and denoted sus2. In resolving chords in minor keys one might move the 2nd or 9th up to the minor 3rd, in addition to moving the maj 7th (using the harmonic or melodic minor scale) up to the root. And in fact is very common to use "sus" as being equal to "sus4". Why "or"? If the 4th was the only possible suspension then is would be unambiguous. The second chord in the sequence is a sus, or sus 4. A "suspension" would keep the 4th in place when moving from V7 to I and typically look like, (5, 7, 11) -> (5, 8, 11) -> (5, 8, 10). The notes of the chords do not have to be in ascending order in either case. A typical chord movement might be as follows, (5, 7, 11) -> (5, 8, 10 (or 3)). The 5th of the V7 chord is often omitted but can move to either the 1 or the 3, being equal distance from each. There is a natural movement of Ti (the 7) "leading" up to Do (the 8 or 1), and Fa (the 4) leading to Mi (the 3rd). ![]() The 5 is a common tone being present in the I chord. ![]() The V7 chord in any Major key is comprised of the following notes from the major scale of the key (5, 7, 9, 11) or equivalently (5, 7, 2, 4). This is the classic example of a cadence where a diminished 5th interval resolves to a major third. Suspension is a very specific device that is typically used in classical music to "suspend" a cadence or resolution where one hears, for example, the 7 going to the 8 and the 4 going to the 3. One thing I will correct is that you seem to think that there is no difference between a sus (suspended) chord and an add chord. There are some standard rules and conventions in place that work well.
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