For 10 points—name this common name of Beethoven's Piano Sonata No. 8 and the 6th Symphony by Tchaikovsky.
One work by this name opens with a movement in alla breve time and modulates from C minor to E-flat before switching to E-flat minor in a section marked Allegro di molto e con brio.  That movement begins with an introductory theme marked Grave, and the work also contains movements marked Adagio cantabile and Rondo: Allegro.  Another work with this name contains a movement that ends with a wind chorale playing over descending pizzicato B major scales, and is marked Adagio—Allegro non troppo, and that work also contains movements marked Allegro con grazia and Allegro molto vivace.  For 10 points—name this common name of Beethoven's Piano Sonata No. 8 and the 6th Symphony by Tchaikovsky.
One work by this name opens with a movement in alla breve time and modulates from C minor to E-flat before switching to E-flat minor in a section marked Allegro di molto e con brio.  
{Pathetique}