Possible Clues:

• John Philip of marches
• John Philip --, American composer of military marches
• Noted march composer
• Musical "phone" namesake
• Composer John Philip —
• Very American, ace composer
• Composer whose work might be appropriate during March Madness?
• 'The Washington Post March' figure
• Bandleader at Garfield's ball
• Composer extremely attached to his country