"The bard must also be able to see the ally.
Depending on the task that the ally has at hand, the bard may use his
bardic music to lift the ally’s spirits, to help him or her focus
mentally, or in some other way. The ally gets a +2 competence bonus
on skill checks with a particular skill as long as he or she continues
to hear the bard’s music. The DM may rule that certain uses of this
ability are infeasible—chanting to make a rogue move more quietly,
for example, is self-defeating."
"Self-defeating" eh? Jag håller inte med:
https://youtu.be/WdJg6Duzzf4