Please be aware that there are multiple regiments that use similar names. Please check also:

Band Of H.M. Royal Marines Plymouth
Band of HM Royal Marines, Portsmouth -> The Band Of HM Royal Marines
Band of HM Royal Marines, Scotland (HMS Caledonia)
Band of HM Royal Marines, Commando Training Centre -> The Band Of Her Majesty's Royal Marines Commando Forces
Band of the Royal Marines School of Music [Portsmouth] -> The Band of the Royal Marines School of Music
(Which is the training center/bandsmen, not the Portsmouth band)