Publisher Desc.  "Faca na Caveira" was originally composed for piano and clarinet for a recital by the composer's son, Jason Ulysses Da Silva, on January 11, 2015, as a student of Maestro Aya Hamada. This is an adaptation for flute quartet."Faca na Caveira (Knife in the Skull)" is the motto for the Brazilian special police unit BOPE. It's a dark and angular piece like the title suggests.