There's no doubt about it (being about heaven). It remind's me of "wayfarin' stranger".
@Bkvader, There certainly will be no more music after this life, if you don't believe on Jesus as he says you must to have Life. If you do (genuinely), you'll be up there (in the "the city") with Dustin when this life's over, and the "feeling" there is better than any optimistic hope. It's the optimistic hope realized forever.