In Arcane Power the Bard lvl 1 Encounter Power Focused Sound says:
Until the end of your next turn, any attack against the target can score a critical hit on a roll of 18-20.
Does this mean that every attack made against the target is a crit on 18-20, or only 1?
If it is only 1 attack how do you determine which attack it is? It says any not first, theoretically if it really is just 1 of any 18-20 on the target then you don't have to choose the first one and save the choice of which one for whom ever would do the most damage.
Personally, I think it would be all attacks against the target that score a 18-20 on the attack roll would be critical hits.