If only the notes given are taken into account the first chord can only be C. Em6 should have a C# in it.
But I agree, the following chords result in really strange chord names although they are just inversions. If the root (and the root in a chord doesn't need to be the lowest note) was clear to LilyPond such errors wouldn't occur. For example if the first chord in the example by Mats was just a voicing for a chord the following chords could be possible: C, Am7, FMaj7, Dm11, Bb7/b9/#11/13 Also LilyPond generates some very strange chord names. The problem is that there is no standard for Chord Symbol notation. But I have never seen in my life things like Bmb6 or C8, at least not in any Jazz score (and believe me, I have seen many) but it can well be that this symbols exist in Pop music, I have really no idea. just my 2¢ regards, Tao > > -------- Original-Nachricht -------- > Datum: Tue, 13 Nov 2007 17:48:48 -0800 (PST) > Von: "Rick Hansen (aka RickH)" <[EMAIL PROTECTED]> > An: [email protected] > Betreff: Re: How to put chords on a score automatically > > > > > Mats Bengtsson-4 wrote: > > > > > > > > Rick Hansen (aka RickH) wrote: > >> > >> Such a program could not make the assumption that the root of the > chord > >> is > >> always being sung by the bass or any other voice, or being sung at > all. > >> But > >> if the lp syntax allowed "marking" what note is the current chord root > at > >> any point in time, then it could generate possible names for the > harmony > >> at > >> that point in time. Otherwise I could see a lot of wrong and weird > chord > >> names being generated by an algorithm that is not being told what is > the > >> root note. Also the root of the chord may not always appear in the > >> score, > >> its common to remove the root or the 5th as they are more "expendable" > >> than > >> the 3rd or 7th, because the 3rd and 7th dedermine maj/min or dominant > >> leading tones, often the root is even more expendable than the 5th for > >> deletion. So what this algorithm would really need is an "invisible > >> staff" > >> that allows you to just name to root notes and duration thereof, this > >> staff > >> is never printed, nor would it participate in midi, etc. it's just > there > >> to > >> tell the algorithm what the current root is at that pont in time, then > >> the > >> real notes in the score are used to come up with a suitable chord > name. > >> > >> BTW your idea sounds like a very cool idea, as I dont know of any > >> notation > >> program that can also do harmony analysis. It would be a quick way to > >> generate the names, then go back and correct the "wrong" ones. Nice. > >> > > LilyPond already does what you describe, see the example in > "Introducing > > chord names" > > in the manual. The following example shows how to do the same if you > > haven't > > entered the music as chords (i.e. using <...>), but have a separate > > identifier for > > each "voice". > > > > \version "2.10.0" > > one = \relative c''{g a g c} > > two = \relative c'{e f d e} > > three = \relative c'{c c b c} > > > > \score{ > > << > > \new ChordNames << \one \two \three >> > > \new Voice << \one \two \three >> > > >> > > } > > > > /Mats > > > > > > > > _______________________________________________ > > lilypond-user mailing list > > [email protected] > > http://lists.gnu.org/mailman/listinfo/lilypond-user > > > > > > > The ambiguity still remains, is the first chord in this example Em6 or C? > Either could be correct. The second chord is probably Am6 but it could > also > be F or Dm7 (with the root omitted). On and on, all these are valid > names > for the notes in your example. IOW an algorithm that is not told the > correct root cant make any assumption. In the key of C the third chord > in > the example would obviously be Bm7b5 (the naturally occuring chord of the > leading tone) but it could also be G (the natural chord of the 5th tone). > Too many mistakes are possible and in most music half the chords would be > wrong, it may work well for nursury rhymes, but not for more complex > music. > > Now if each note can simply be marked as the root then the algorithm > could > work correctly, when the root is being omitted of course that mark would > have to be even more explicit by naming a non-printing note as well. > > > > -- > View this message in context: > http://www.nabble.com/How-to-put-chords-on-a-score-automatically-tf4783962.html#a13738521 > Sent from the Gnu - Lilypond - User mailing list archive at Nabble.com. > > > > _______________________________________________ > lilypond-user mailing list > [email protected] > http://lists.gnu.org/mailman/listinfo/lilypond-user > -- Psssst! Schon vom neuen GMX MultiMessenger gehört? Der kann`s mit allen: http://www.gmx.net/de/go/multimessenger
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