Simplify the following text for a Grade 9 native English-speaking person.
Original: In the Hercules : The Legendary Journeys episode , `` Unchained Heart '' , in which Xena is introduced , the original `` Kaval Sviri '' is the music used to announce Xena racing into battle .
Simplified: The original `` Kaval sviri '' can be heard where Xena races into battle in the Hercules episode `` Unchained Heart '' .