Protect Working Musicians Act of 2021 This bill allows certain individual music creator owners to collectively negotiate music licensing terms with dominant online music distribution platforms. Individual music creator owners include musicians, producers, and technicians who own the copyright to a recording and either (1) earned less than $1 million in associated revenues during the prior year, or (2) qualify as a record production and distribution small business. Dominant online music distribution platforms include interactive online services with annual revenues from music distribution of more than $100 million.