  Gravitational Sound clips produced by the Laser Interferometer
Gravitational-Wave Observatory (LIGO) and the Massachusetts Institute of
Technology (MIT) are considered within the particular context of data
reduction. It is shown that these types of signals can be approximated at high
quality using much less elementary components than those required within the
standard orthogonal basis framework. Furthermore, a measure a local sparsity is
shown to render meaningful information about the variation of a signal along
time, by generating a set of local sparsity values which is much smaller than
the dimension of the signal. This point is stressed further by recourse to a
more complex signal, generated by Milde Science Communication to divulge
Gravitational Sound in the form a ring tone.
