Muscat, Nov 5 (ONA) --- The Royal Opera House Muscat (ROHM) and the Omani Military Music band present annually in November a wide range of military performances, as part of the Sultanate's celebrations of its glorious National Day.         The performances will be held under the patronage of Sayyid Khalid bin Hilal Al Busaidi, Minister of the Diwan of Royal Court, with the participation of the music bands of the Royal Guard of Oman, the Royal Army of Oman, the Royal Air Force of Oman, the Royal Navy of Oman, Royal Oman Police, ...