Midi file names

[Jay Anderson]

Is it possible to specify the name of the midi file being created? (I
remember some talk about this in the past but I couldn't find the
result of the conversation.) For example let's say I have a book with
a bunch of short scores (i.e. an etude book)

example.ly:
===========
\book
{
  \score
  {
    \new Staff {...}
    \layout {...}
    \midi {...}
  }
  \score
  {
    \new Staff {...}
    \layout {...}
    \midi {...}
  }
}

The output is example.midi and example-1.midi. What I want instead is
example-1.midi and example-2.midi or something similar. The two
work-arounds I can think of are create a blank first midi file or have
a script to rename them all after running lilypond. Thanks for the
help.

-----Jay