followKey

[Erik Sandberg]

Hi,

Here's a function that makes alterations follow the current key signature. 
IIRC, this has been discussed a couple of times before, but it wasn't 
implemented because developers didn't think it would be useful enough. I 
can't recall if anyone actually _tested_ it though, so here it is.

A known problem is that this command doesn't work together with the 
\interpolate command I wrote yesterday.

Syntax:
\followKey { music }
Behaviour:
All pitch alterations are taken relative the default of the current key 
signature. So, in C major, nothing happens, while in G major, an f becomes a 
fis and a fes becomes an f.

Example:
\relative {
  \key cis\major
  \followKey { c d e f \key d\major g a b ces des }
}
=>
\relative {
  \key cis\major
  { cis dis eis fis \key d\major g a b c des }
}

-- 
Erik

follow-key.ly
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