Related Clues:

• Hard-to-hum, in a way
• Like Stravinsky's later works
• An alto in composition lacking an established key
• Lacking a key, perhaps
• Hard to tap one's toe to
• Area with mostly lofty houses working without a key
• Without a key, in music
• An alto sadly lacking a certain musical quality
• Keyless, as some festival entries
• Modernist music descriptor
• Like some Alban Berg works
• Of music, lacking an established key
• Not written in a key
• Like some 20th-century compositions
• Like much of Schoenberg's music