Gortoz a Ran - song performed by Denez Prigent & Lisa Gerrard was also used in the movie Black Hawk Down. The song is in Breton language.
The episode title translates to "DNA".
In this episode both McGarrett and Junior repeatedly mispronounce "cache" (as in "weapons cache"), they say "cash-AY" - it should be pronounced "cash" (as in money). Cachet/cash-AY is a completely different word with a meaning similar to "prestige".