I would say that music has been extrapolated from 600-year-old carvings, not 'decoded'.
modapi writes "StorageMojo is reporting that a company at Storage Networking World in San Diego has made a startling claim of 25x data compression for digital data storage. A combination of de-duplication and calculating and storing only the changes between similar byte streams is apparently the key. Imagine storing a terabyte of data on a single disk, and it all runs on Linux." Obviously nothing concrete or released yet so take with the requisite grain of salt.