Guild Wars 2

Hi, I’m trying to get the Uzolan’s Mechanical Orchestra collection done but I’m missing one last item, the Adventurous Melody which drops from adventure reward chests.
I already did a lot of adventures the last 2 weeks, but just don’t get this drop.
Am I doing something wrong ?
Did anybody get this drop already?

Maybe I was lucky, but I did three adventures, got seven chests all in all and it dropped out of a silver box. (From the Itzel beetle adventure, by the way)
So yeah, it does drop. Maybe it’s rare and I was lucky, or you are unlucky.

Ok, you where really lucky.
I did like 30 chest, but finally got it from Scrap Rifle bronze chest.
I got all other drops for the various collections really quick, so I got nervous