It's somewhat subjective, but I think most people would agree on at least leaving out the 5th. However if the music exam asks how a C13 chord might actually be played in practice, then I'd say that the importance order of the notes when a C13 is written to be used as a dominant or blues chord is, from most important to least important: 7, 3, 13, 1, 9, 11, 5. Short answer: in a music theory exam question asking what notes there are in a chord named "C13", a C13 has the notes 1,3,5,(flat)7,9,11,13, i.e. They are by and large very helpful - and there are example test books which will give clues, too. With 11th and 13th chords, it's best to listen carefully to what voicings will work in each circumstance - and omit notes accordingly.ġ1th chords often miss the 9th note (and/or 5th), and 13th chords can miss the 9th and 11th notes, without losing their recognisable sound.Īs far as exams are concerned, sometimes they're more concerned with theory rather than practice, so are occasionally in a parallel universe (!) so here, it makes sense to actually ask the question to the board in question. An obvious is the 5 (unless it's +5 or -5), but that still leaves potential clashes of other notes. Let's face it - a C13 could contain C,D, E, F, G, A and B/B♭! Which may be possible to voice nicely in an orchestra or bigband, possibly on piano, impossible on guitar. However, when it comes to 11th and 13th chords, things can get very muddy. So, a 9th chord will basically be 1,3,5,7 and 9. In real life, anything above a 7th chord must contain that 7th note - be it a major, minor or even diminished seventh.
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