Also including works nicknamed "Appassionata" and "Pathétique," for
 10 points, name this group of Romantic piano pieces, whose 14th is nicknamed "Moonlight."
One of these pieces, its composer's opus 90, begins with a movement its composer described as a
 "contest of the head and the heart." The two of these pieces that make up their composer's opus 49 consist
 of only two movements and are known as their composer's "two easy" ones. The three major ones of their
 composer's middle period include one dedicated to Franz von Brunswick and one whose movements are
 entitled "The Farewell," "The Absence," and "The Return." These thirty-two pieces include works
 nicknamed "Les Adieux" and "The Tempest," as well as a piece beginning with driving C major chords
 which is nicknamed "Waldstein." Also including works nicknamed "Appassionata" and "Pathétique," for
 10 points, name this group of Romantic piano pieces, whose 14th is nicknamed "Moonlight."
One of these pieces, its composer's opus 90, begins with a movement its composer described as a
 "contest of the head and the heart.
{piano sonatas} of Ludwig van {Beethoven} [prompt on partial answer]