  We present a technique to search for the presence of crucial events in music,
based on the analysis of the music volume. Earlier work on this issue was based
on the assumption that crucial events correspond to the change of music notes,
with the interesting result that the complexity index of the crucial events is
mu ~ 2, which is the same inverse power-law index of the dynamics of the brain.
The search technique analyzes music volume and confirms the results of the
earlier work, thereby contributing to the explanation as to why the brain is
sensitive to music, through the phenomenon of complexity matching. Complexity
matching has recently been interpreted as the transfer of multifractality from
one complex network to another. For this reason we also examine the
mulifractality of music, with the observation that the multifractal spectrum of
a computer performance is significantly narrower than the multifractal spectrum
of a human performance of the same musical score. We conjecture that although
crucial events are demonstrably important for information transmission, they
alone are not suficient to define musicality, which is more adequately measured
by the multifractality spectrum.
