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Re: m7.5- transposed to sus#4 b3 ??

From: Malte Meyn
Subject: Re: m7.5- transposed to sus#4 b3 ??
Date: Mon, 11 Nov 2019 22:00:04 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.1

Am 11.11.19 um 21:38 schrieb Sandro Santilli:
I transcribed an A major song with this chords snippet:

   ees:m7.5- | aes:7 | aes:m7.5- | des:7 |

Are you sure you want those chords instead of

dis:m7.5- gis:7 gis:m7.5- cis:7

? Who wants to read a a-flat half-diminished chord (a-flat c-flat e-doubleflat g-flat)?

When transposing it to Eb major it is rendered as:

   Bbbø | Ebb7 | Ebb7sus#4 b3 | Abb7

I don't understand why the third chord (m7.5-)
gets rendered as a "7sus#4 b3" chord, very hard
to read ...

The bigger problem is that while a-flat half-diminished is at least hard to read, e-doubleflat half-diminished is just insane.

LilyPond 2.18.2 did the most sane thing it could do and changed the b-tripleflat to a a-flat in that chord. You can see this if you output not only as ChordNames but also as regular notes:

\version "2.18.2"

C = \chordmode {
  ees:m7.5-  aes:7 aes:m7.5- des:7

\new Staff \C
\new ChordNames \C
\new Staff \transpose a es \C
\new ChordNames \transpose a es \C

Ideally I'd also like to avoid the double flats,

You definitely should do that. Ideally by not using the single flat chords in the a major version in the first place … But if you really want to keep them, try transposing to d-sharp instead of e-flat.

but what strikes me is the "sus#4 b3" part, is it
a bug ? I'm using GNU LilyPond 2.18.2 and the
.ly file has a \version "2.18.2" header.

LilyPond 2.19.83 can handle triple flats (but cannot show them as notes because it doesn’t really know how a triple flat accidental should look like) so the output of the snippet above is “correct” with that version.

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