What purpose does “Bill C-31 Blues” serve? What was Bill C-31?

What will be an ideal response?

• It is a " . . . clever and ambitious composition that attempts to communicate and inform listeners about some of the very complex ways that the Canadian federal government laws regarding the legal definitions of First Nations identity can have an enormous impact on the day-to-day lives of the aboriginal peoples of Canada."
• Bill C-31 allowed for people who had "previously lost their federally recognized Indian status, through enfranchisement or marriage, to have their status reinstated."