Answer: fminor

AnswerCrossword Clue
FMINORKey of Chopin's Piano Concerto no. 2
FMINORKey of Haydn's "La Passione"
FMINORKey of Beethoven's "Appassionata"
FMINORKey of Beethoven's "Appassionata" Sonata
FMINORKey of Chopin's Piano Concerto No. 2
FMINORKey of Brahms's Piano Sonata No. 3
FMINORChopin's "Ballade in ..."
FMINORKey with four flats
FMINORRelative of A-flat major
FMINORKey of Chopin's "Piano Concerto No. 2"
FMINORScale-book scale
FMINORBeethoven's "Appassionata" is in it