Many definitions of a chord require a third note, drawing from Euclidean geometric definitions: "two points define a line; three define a plane, four define space". The parallel definitions would state that two notes define movement of pitch, but three are needed for a chord in order to define its quality major, minor, suspended, augmented, diminished.
However, two notes, especially two lines of notes, can indicate the quality of a key in which the performers are singing or playing. The full choir is in more or less three-part harmony; though there are four parts, two or more double on each sustained chord. But then the middle portion drops to a duet. With the tonal quality of the piece defined by the fuller harmony, the movement of the soloists relative to each other implies the same tonal quality even though the third note, which would explicitly define that quality, isn't there.
Personally, two pitches are not sufficient to define a chord because it is incomplete. Three is the minimum. When you press two strings in a guitar, it may produce some sort of a chord but it is not complete.
For instance, when we play a power chord which consists of the root note and the fifth interval, it could be either a major chord or a minor chord. It can only be known based on other chords used along with it.
And according to the Intervals Wikipedia page, an interval is. These terms are somewhat related. An interval represents the space between two sets of notes either harmonic or melodic.
The notes of chords are a set interval from each other a third. The thing is that the main tonal center for the character of a chord is the third.
The fifth is a lot less important and only gives any meaningful function when you are busy with augmented or diminished chords. So in essence, if you have a note and a third you have a rudimentary chord.
You also often see in tonal harmony seventh chords that only have three chord notes with the fifth omitted. It is, in essence, a case of all chords consists of intervals but not all intervals are in chords.
I don't think this is entirely correct. You have both arpeggios and broken chords that are not played at the same time and to me still count as chords in the broader sense of the word. Also, piano players often have to roll their chords and if this is the case the notes of the chords are not played exactly at the same time. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
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Which of the following is released from the host cell in response to the presence of lipid A? Is there any temporary gamification on this website Something like badges or points available for a short period of time? Other intervals, the second and the seventh and their compound forms are considered dissonant and require resolution of the produced tension and usually preparation depending on the music style used. It should be noted that the effect of dissonance is perceived relatively within musical context: for example, a major seventh interval alone i.
C up to B may be perceived as dissonant, but the same interval as part of a major seventh chord may sound relatively consonant. A tritone the interval of the fourth step to the seventh step of the major scale, i. Please click on the following link to participate in an interactive lesson on intervals: Specific Intervals.
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