Possible Clues:

• One of the black keys
• Key of Beethoven's Piano Sonata No. 24
• Only key Irving Berlin composed in
• Black key that's the first of a threesome
• Tough key for pianists
• Bach's 'Toccata in -- Minor'
• Musical neighbor of G
• Key that's oxymoronic at school?
• Major scale in which B is the only natural
• G neighbor