Lis was wondering how many songs are called "Heart & Soul."

Lis had me find on YouTube the video for Monkees' 1987 song "Heart & Soul", from their first reunion album.  No Michael Nesmith, but the other three.

 

The song is remarkable for sounding like the exact center point of 1987 pop music.  They had three original songs on their 1987 album, and you listen to them, and you realize that there are basically three streams on late Eighties pop, and they've written the three most absolutely median, average Eighties pop songs imaginable.

 

How are they?  Well, they're okay.  Exactly okay.

 

Anyway, the point is that this one is titled "Heart & Soul", a title that's been used from Tin Pan Alley to T'pau.  tsort.info lists seventeen songs by that title that charted, but it's not trivially obvious how many of those are covers of one another.  And, of course, there may be some that never charted anywhere, but I'm willing to ignore those for purposes of this question.

 

Wikipedia lists fourteen, the most significant of which are probably Hoagy Charmichael, Hughey Lewis and the News, and T'pau.