Possible Clues:

• Interrupt; hang
• 'Symphony of a Thousand' composer
• Gustave ......, noted Austrian composer-conductor
• Gustav —, Austrian symphonist
• 'Um Mitternacht' composer
• Composer whose works include Das Lied von der Erde
• Man who composed Harlem Shuffle
• 2: chap stealing hearts, ending in despair
• Composer whose sixth and seventh symphonies have parts for cowbells
• Austro-Bohemian Romantic composer and conductor, d. 1911