Possible Clues:

• ''Rule, Britannia!'' composer Thomas
• Politician and basketball player Duncan
• Obama cabineteer Duncan
• 'A-Hunting We Will Go' composer
• Brit who inspired Mozart
• Thomas --, composer of 'Rule Britannia'
• Thomas --, 1710-78, English composer
• Thomas ____ wrote the music for Rule, Britannia!
• Composer Thomas whose surname is an anagram of 94 Across
• His anthem is heard in Beethoven's ''Wellington's Victory''