Deep Breathing

Your immense lung capacity and practice enables you to play elaborate musical phrases on wind instruments (e.g. bagpipes, flute, horn, pan flute, shawm) that would otherwise be impossible. Whenever you make an ability check related to playing a wind instrument with which you have proficiency, you can add double your proficiency bonus to the check, instead of your normal proficiency bonus.

Adapted from Circular Breathing by danlite