A Brazilian rapper named MC Fioti had a hit in 2017 called “Bum Bum Tam Tam.” It was all about booty. But now it’s been redone, most recently by MC Fioti himself, all because the title sounds almost identical to the Butantan Institute (Instituto Butantan), which has been conducting Brazil’s research into COVID-19 vaccine effectiveness. Host Marco Werman listens to the variations.