RE: multiple tempi in a single piece

[Kieran Coulter]

Hi Mats,

I think it belongs here,

http://lilypond.org/doc/v2.10/Documentation/user/lilypond/Creating-MIDI-files#Creating-MIDI-files

Where it mentions how to set the default tempo (which I assume is the global 
tempo for most pieces that don't change tempo).

I would then distinguish between wanting simply for the metronome markings 
present, wanting the markings and the correct tempo changes, and wanting the 
tempo changes but not caring about markings (as is the case for Trevor). Also, 
make it as clear as possible when a way of working with Lilypond has the effect 
of managing metronome marks, and when it affects the tempi within the MIDI file 
itself.

In my case, we are requiring that we indicate default tempo expectations so 
that we can allow users to start with that tempo (we will try and make it as 
appropriate as possible) or adjust to a tempo that is comfortable for them, 
relative to a known tempo.

Although it is of course most fitting in many older pieces to only have the 
Italian indication, we have need for the special case I mentioned above, and we 
will be sure to say wherever appropriate that these are not our personal 
recommendations, just that we need to define the default tempi so that rhythm 
tracking works properly!

Also if we don't include tempo changes within the file itself, and instead 
resort to modifier tables, it's just an extra table to embed into the per-piece 
database structure. With this figured out would still have 4 out of 5 tables 
left to integrate, if we are going to  try and fight to get a better MIDI file 
standard some more (although it looks like we will finally be getting around to 
it!).

Thanks for the tip Trevor, I will try it out!

So just to be totally sure, 

1) you add the tempo map, "killing time" with s's, as its own voice? 

2) Do you still need to add the global default tempo in the MIDI block if you 
do this?
 tempoWholesPerMinute = #(ly:make-moment 72 4) 

3) If so, and you also explicitly add a tempo in measure 1 of your tempo voice, 
and they are different, does it produce an error or does one override the other?

Thanks again!

Kieran







>------- Original Message Follows -------
>From: "Mats Bengtsson" <address@hidden>
>To: "Trevor Daniels" <address@hidden>
>Cc: "Kieran Coulter" <address@hidden>, <address@hidden>
>Subject: RE: multiple tempi in a single piece
>Date: Thu, 04 Oct 2007 08:58:11 +0200
>
>Kieran,
>
>Can you provide some hints on how to make this even easier
>to find in the manual? If you read the section on "Creating
>MIDI files", it says "The tempo can be specified using the \tempo 
>command within the actual music, see Metronome marks."
>and if you follow the link to Metronome marks, you will see
>exactly the type of solution described below.
>
>Trevor, why do you include the \override Score.MetronomeMark #'padding
>= #3.0
>setting? Since you just set the metronome marks transparent, they will
>
>still influence the staff spacing and if you increase
>the padding, the spacing will be even wider. If you don't want
>the tempo changes to influence the printed layout, I would rather
>recommend to use
>\override MetronomeMark #'stencil = ##f
>instead of transparent = ##t, which removes them completely, not
>just makes them transparent.
>
>   /Mats
>
>Quoting Trevor Daniels <address@hidden>:
>
>> Hi Kieran
>>
>> The following shows how I change the Midi tempi - you can
>> easily adapt this example to do what you want:
>>
>> TempiA= {
>> \override Score.MetronomeMark #'padding = #3.0
>> %Page 1 System 1 Bar 1
>> \tempo 2=80 s1 | s | s | s | s | s | s |
>> %Page 1 System 2 Bar 8
>> % the following tempo changes implement the fermata in bar
>> 9
>> \override Score.MetronomeMark #'transparent = ##t % hide
>> the marks
>> s1 | \tempo 2=50 s | \tempo 2=80 s | s1 | s | s | s | s | s
>> |
>> %Page 1 System 3 Bar 17
>> % the following tempo changes implement the fermata in bar
>> 18
>> s1 | \tempo 2=50 s | \tempo 2=80 s | s | s | s | s | s |
>> }
>>
>> I simply insert this in parallel with the music.
>>
>> Trevor
>>
>> -----Original Message-----
>> From: address@hidden
>> [mailto:address@hidden
>> On Behalf Of Kieran Coulter
>> Sent: 10 July 2007 01:51
>> To: address@hidden
>> Subject: multiple tempi in a single piece
>>
>>
>> Hi everyone,
>>
>> I am sure there is a way to do this, but maybe someone here
>> has already faced this challenge and can help show me how it
>> can be done.
>>
>> My example is the Bach Sinfonia from Partita #2. It has a
>> Grave, Andante, and Allegro, but the MIDI file plays all the
>> sections at the same speed, 120bpm. I am looking for a way
>> to modify the .ly file so that it generats a MIDI file that
>> plays the Grave at say 40bpm, the Andante at 80bpm, and only
>> the Allegro at 120bpm.
>>
>> I would greatly appreciate any help to discover how to do
>> this!
>>
>> Thanks,
>>
>> Kieran Coulter
>>
>>
>>
>>
>>
>> _______________________________________________
>> lilypond-user mailing list
>> address@hidden
>> http://lists.gnu.org/mailman/listinfo/lilypond-user
>>
>
>
>