You should find a copy of Labyrinth: The Visual History where the interviews on writing, casting, and costuming spell this out. Henson decided to cast a rock musician as Jareth for a reason, and the book is worth reading if only to see the other names on the casting memo.

Pseudo-adolescent and ALL AMERICAN. Rock n roll, cars, baseball, teen sex.

This one? http://www.morphizm.com/rec…

Or is it worth pointing to "Radio Song" (also a single) as the actual shrill ("I CAN'T HEAR IT") cash-in (KRS-One) of the album?