Monsters and the Music

The necklace hung on the Siello reacted violently at first, but then started to play a beautiful melody. Its song elates me, and it is also whispering something to me. It's whispering…….
I get it, now. The <HFFFA7272>Ethen Berserkers in Southern Singing Cave Mushroom<HFFFFFFFF> have <HFFFA7272>Hilde's Music<HFFFFFFFF>. Unfortunately, the score has been torn into several sheets and all must be recovered. The necklace is telling me that there are <HFFFA7272>50 sheets<HFFFFFFFF> to be recovered. I must hunt them down, recover all the sheets and bring them to <HFFFA7272>Singer Lailat in the Center of the Contra House<HFFFFFFFF>.

Let's recapitulate what I must do. I have to hunt down the <HFFFA7272>Ethen Berserkers in Southern Singing Cave Mushroom<HFFFFFFFF> to recover <HFFFA7272>50 Sheets of Hilde's Music<HFFFFFFFF>, and then return them to <HFFFA7272>Singer Lailat in the Center of the Contra House<HFFFFFFFF>.

That's the score! Did you find them there?

So that's what happened. Thank you so much. The recital will go ahead, thanks to your help.
However, there is one more thing I must ask of you.