Should You Still Buy CDs?
In music a chord describes the relationship between at least two different pitches. Realizing chords is the analysis of intervalic relationships. It is easiest to analyze a chord if the pitches are being observed simultaneously. If pitches do not occur at the same time it may be more appropriate to identify the pitches as part of a key signature, even if enough the notes presented over time to outline a chord structure.
While it is possible to analyze a chord with just two notes within a given key signature, like a D5 chord, three notes can provide a more in depth description. A triad is made up of three tones as follows: