Let me see if I can help

Hum a few bars two actions Feat 7

General Skill
Prerequisites master in Performance
Frequency twice per day

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You’ve picked up a few things on the stage. You can attempt a Performance check to be considered trained in a skill you are not trained in. The DC is usually a standard-difficulty DC of a level equal to your level. If you succeed, you are considered trained in that skill for your next use of that skill. You still use the normal ability score to determine your total bonus to all checks with that skill.

Thoughts?