Dr. Jennifer Groh

So you got your red versus green signaling something very different.

And most places have those lights oriented vertically.

which gives you a second cue to what needs to be conveyed here.

Right.

It's not the same light switching, and one is on top and the other is on the bottom.

It's more of a problem when in some intersections the set of three lights is oriented horizontally.

Oh, sure.

I mean, that's music, right?

So can we go into the music realm to talk about this?

Okay, good.

So one of the things that I think is fascinating about music is that it's universal and nobody really knows what it's for.

Like it's pretty clear that language –

is useful to us, right?

It, you know, helps us exchange information.

So pretty obvious that language is a benefit, a survival benefit for individuals and for the species as a whole.

We don't really have as clear a view of why music, you know, what role did music play in our success in evolution, natural selection?

Music, it really is universal.

Every human culture has it.

There is some variation as to whether or not a culture embraces melody, embraces harmony, but every culture has rhythm.

You can't have melody or harmony without rhythm.