Greg,
The chorus ( great harmonies!) on this song is beautiful-reminds me why you are one of my favourite vocalists on this forum.
Though not a huge Tom Petty fan I can relate to these fine lines:

I remember loving American Girl
when rock`n roll was a force in the world
nowadays music is so absurd
what are we gonna do
now we`ve lost you too

you`ve channelled a sad feeling into a very good song; I hope doing that helps you keep going.

Robert