Its third movement contains both a clarinet solo and a piano cadenza, which both serve to represent a nightingale's song near the Janiculum.  
Trumpets and drums depict an army marching to the Capitol in the fourth movement.  Its third movement contains both a clarinet solo and a piano cadenza, which both serve to represent a nightingale's song near the Janiculum.  The first movement, an Allegretto vivace in 2/8 time, represents children playing by the Villa Borghese near the title objects.  The most famous movement of this piece, however, is the second movement in which muted horns represent the title objects near a catacomb.  FTP, identify this orchestral work by Ottorino Respighi about the trees of a certain city.
Trumpets and drums depict an army marching to the Capitol in the fourth movement.  
The Pines of Rome or Pini di Roma