Name That Tune - Round 14 Mystery Cache

And now, on to the next round of Name That Tune...
Watch carefully...
Just like the earlier rounds, you will be supplied with one or more lines of song lyrics, you must guess the song title and use it to solve the puzzle.

"Is it all in that pretty little head of yours?
What goes on in that place in the dark?
Well I used to know a girl and I would have sworn
that her name was __________"

Use a simple substitution to transform each letter of the song title into a
number (a=1, b=2, c=3, etc.) and plug those into the formulas below to find the final coordinates:
N 41° 59.ABC W 087° 48.DEF.

ABC = 3rd letter * 5th letter - 2nd letter - 8th letter
DEF = (1st letter * 4th letter - 2nd letter²) * 2