Maestoso, indeed!  When I play this, I hear a brass band performing in a public square in Bergen, Norway, where Grieg had a country villa.  I’m using my imagination, but I’m sure it happens!  This piece is a fantastic way to practice bringing out the melody while playing chords.  Of course, there are secondary voices that should be clearly heard, as well.  Grieg was obviously paying close attention to voice leading while composing this final piece of Op. 12.