And that's why CSI is fiction

From the AP story "Mozart mystery just gets murkier":

After months of sophisticated DNA sleuthing reminiscent of a "CSI: Crime Scene Investigation" episode, forensics experts admitted Sunday on national television that they still can't say with certainty whether an ancient skull belonged to the composer, as some believe.

They tried to compare the mtDNA of the skull with two maternal relatives from the "Mozart family grave" in Salzburg. But the maternal relatives didn't have the same mtDNA sequence!

Experts had assumed the remains were of Mozart's maternal grandmother and a niece. But DNA analysis showed that none of the skeletons in the grave were related, making it impossible to prove that the skull was Mozart's, Parson said.
"The dead took their secrets to the grave," the documentary concluded.

Or someone else's, evidently.