Tracks Drums usability, Tinnitus debuff and Bloodlust + Heroism. Drums of Battle and Tinnitus.
If you can't do Drums (not Leatherworker) or you haven't got Drums in the bag, it won't show the Drums Usable icon.
Keywords: tinnitus, drums of battle, heroism, bloodlust, tinnitu, drums, battle, drum, tracker