Sound file from the Mock Data Challenge that contains several easy-to-hear coalescences of massive black holes at redshifts of 1 and 2, several Extreme Mass Ratio Inspiral (EMRI) signals, and thousands of galactic binary signals. The noise of the binaries is so loud that the naked ear can't make out the EMRIs. These can, however, be extracted by sophisticated pattern-matching. The signal also includes simulated instrumental noise, but this is so much weaker than the binary background that one can't hear it. This signal has been shifted upward in frequency by a factor of about 4 million, or about 22 octaves, in order to put the Supermassive Black Holes (SMBH) inspirals into the audible range. This is not the entire gravitational wave universe of LISA, but it gives an idea of its richness!