"The team, which comprised musicologists, psychologists, linguists, evolutionary biologists and professional musicians,..."
Basically psychologists who still fail to engage musicologists since the death of pre-WW2 Comparative Musicology, who were ghosted by all ethnomusicologists, but who pick up dilettantes here and there to give the appearance. This Popular Science article thing, with the "WE make music" and "OUR ancestors" language will keep filling newspapers as long as people think "ooh, music, love that!" and "ooh, scientific studies, they're so official!"

It all makes about as much sense as "The Science of Race" or "The Science of Religion"... which is to say it seems to make a lot of sense to people who share some assumptions about race or religion, and also feel (ironically or not) that science is a glorious thing. Which is to say, that it's not very scientific.