The main theme of the third movement rondo of one of these pieces is played once with a long pedal and later over a sustained trilled G. Another has the word "Lebewohl" spelled over its first three chords; that piece, titled Les Adieux, commemorates the departure of Archduke Rudolf. These pieces also include one whose Adagio sostenuto first movement may have been inspired by a view of Lake Lucerne. That work is subtitled "Quasi una fantasia"  and
The main theme of the third movement rondo of one of these pieces is played once with a long pedal and later over a sustained trilled G. Another has the word "Lebewohl" spelled over its first three chords; that piece, titled Les Adieux, commemorates the departure of Archduke Rudolf. These pieces also include one whose Adagio sostenuto first movement may have been inspired by a view of Lake Lucerne. That work is subtitled "Quasi una fantasia"  and is in C# minor. For 10 points, name this group of works for a certain keyboard instrument that include the Hammerklavier, Waldstein, and Moonlight ones, written by the composer of Fur Elise.
The main theme of the third movement rondo of one of these pieces is played once with a long pedal and later over a sustained trilled G. Another has the word "Lebewohl" spelled over its first three chords; that piece, titled Les Adieux, commemorates the departure of Archduke Rudolf.
Beethoven’s Piano Sonatas [Accept equivalents. Prompt on “Piano works by Beethoven.”]