Showmanship + Great Sound + Mystery + An element of fear of the unknown + Fantastic Big Band Act = Formula for Success
I think Dave sums it up very nicely. From an analytical (and musical) point of view, this is an incredible musical presentation. From the 'mysterious' beginning to the glorious climax, the creativity and musical precision (call it 'musicianship' -- from all the players) is just fantastic. This doesn't have to be your 'cup of tea' in order to appreciate the effort and talent that went into this production. I love experiencing stuff that's 'outside the box'.
chas