The Ives Series continues in Danbury tonight at 7:30pm at the Marian Anderson Recital Hall at the Danbury Music Centre for a concert entitled 'Celestial Mechanics.'  It's built around George Crumb's famous piece, a four-hands piano work from which selections will be performed.  The piece physically alters the sound of the piano to create a unique sound.  Other pieces that thematically deal with ascent and/or descent into the heavens, will also be performed.