Possible Clues:

• Very good opera ultimately that inspires American composer
• March king John Philip
• John Philip ___, 'The March King'
• He enjoyed march madness
• This composer's phone may be found in the band
• "Marching Along" autobiographer
• John Philip ..., composer of military marches
• March master John Philip ___
• "The Washington Post" composer
• Composer of many patriotic tunes