Maybe they've picked up a few art funding dollars from a government grant that was willing to finance their conceptual art project, and it's a potential paying gig for a musician. Or of course it could be simply be a strange ad posted by an eccentric person with all sorts of potential for a highly weird experience for any who dare to answer it.
I keep hearing' Danger Will Robinson! Danger approaching!', go off in my mind when I read this one.

It's a hoot. Thanks for sharing it.