@mikemearls @ChrisPerkinsDnD If a bard is proficient in performance and uses a instrument they are proficient in, do they add the bonus 2x

— Michael Shiel (@SwordandShiel) January 13, 2016

Depends – it does if it is a use of Performance (trying to entertain) vs. use of an instrument (technical skill). https://t.co/242WHQreYP

— Mike Mearls (@mikemearls) January 13, 2016

@KevKalElI thought you could only ever add your proficiency bonus ONCE to any given rule…? some class features allow you to double it in certain circumstances

— Mike Mearls (@mikemearls) January 13, 2016

@SwordandShiel @ChrisPerkinsDnDtrying to entertain while using an instrument? I'd make that a Performance check and apply double bonus if the bard has Expertise in that skill (PHB, p 54)

— Mike Mearls (@mikemearls) January 13, 2016