  We study the classical and quantum black hole information in gravitational
waves from a black hole's history. We review the necessary concepts regarding
quantum information in many-body systems to motivate information retrieval and
content in gravitational waves. We then show the first step in an optimal
information retrieval strategy is to search for information in gravitational
waves, compared to searching for correlations in Hawking radiation. We argue a
large portion of the information of the initial collapsing state may be in the
gravitational waves. Using the Zerilli equation for particles falling radially
into Schwarzschild black holes, we then describe a method to retrieve full
classical information about infalling sources, including masses, infall times
and angles.
