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The sheet below is depicting a "inderteminate chord": the piece is in F# minor and the chords have 2 notes each: F# and C#. THE CHORD DOESN'T INCLUDE THIRDS:

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The modern definition is power chord. Used a lot by guitarists, often with distortion or overdrive.

'Indeterminate' can be used as it's neither major nor minor, having no 3rd.

It works well with guitar, as distortion highlights harmonics, and those of 1 and 5 sound fine together, but when a 3rd (either maj. or min.) is played as well, its harmonics clash with those others.

Otherwise known here as F♯5 - some argue that it's not even a chord, having only two notes, but a dyad. There are occasions in composing where the writer wants a harmony that doesn't fall into major or minor. This fits the bill.

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The chord symbol for this, an open 5th on F♯, is 'F♯5'. Or maybe 'F♯(no 3rd)'. A symbol like 'F♯(no 5th)' could be used for an F♯-A♯ dyad.

'Indeterminate chord' is a rather vague description. If you intend to use it in an analysis I suggest you define your usage first.

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  • I would attach a sample sound file containing f#5 chord in 8 notes, but i cant attach here, so it woould be better to use google drive and post a link? – TechnicGoblin5R Dec 15 '19 at 23:29
  • I don't think this really answers the question. "If you intend to use it in an analysis I suggest you define your usage first". That's literally what they are asking for. – WillRoss1 Dec 15 '19 at 23:50
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    But, @WillRoss1, they can't have what they're asking for. Because "indeterminate chord" isn't a standard, precisely-defined musical term. – Laurence Payne Dec 16 '19 at 0:52
  • I learned about them in college, so definitions do exist. Whether they are widely accepted may be a different matter. – WillRoss1 Dec 16 '19 at 4:32
  • @WillRoss My research before answering the question found several mentions of Indeterminate Chords, each defined them differently! So, I repeat, if YOU want to use the term, make YOUR definition clear first! – Laurence Payne Dec 17 '19 at 0:03
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Strictly speaking, the term "indeterminate" means that you cannot determine the quality of the chord with the information given. You might be tempted to use the surrounding context to determine that's it is most likely F#m, but even this claim is invalid.

It isn't a matter of not knowing if it's minor or major. Fundamentally, it is neither. It essentially has not been assigned a quality at all. This, in some sense, can almost be considered a third quality, a power chord.

Adding an A because "it's probably F#m" is no different from adding an E because "it's probably F#m7". You wouldn't be guessing information you don't know, you would be adding information that wasn't there before at all.

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