Basically, any income you receive for performing a service in PA would be PA taxable compensation.
"For Pennsylvania personal income tax purposes, the term “compensation” includes salaries, wages, commissions, bonuses and incentive payments whether based on profits or otherwise, fees, tips and similar remuneration received for services rendered as an employee or casual employee, agent or officer of an individual, partnership, business or nonprofit corporation, or government agency, whether directly or through an agent, and whether in cash or in property." Gross Compensation
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