There are now Four tiers of ECAs. Extracurricular Activities
Tier I ECA are activities of a professional nature that "develop the Brigade of Midshipmen" These are ECAs that support the Brigade and "advance midshipmen interest in individual warfare communities." Semper Fi, NA Avidation Society, Surface Navy Assoc, Dolphin Club, YP Squadron
Tier II ECA are those that include Academic ECAs.
Chemistry Club, Marine Technologly, Society of Women Engineers, French Club, Am. Society of Navaly Engr.
Tier III ECA are orgs whose existence is of special importance due to their contribution to the successof the NA. Tier III are charged w/ carrying out official functions on behalf of the NA. NOTE: "Special procedures permitting deviation from normal routines of the Brigade MAY be authorized on a case by case basis." This tier includes musical groups, spirit activities and ceremonial activities.
Tier IV ECA are recreational activities. Midshipman Action Group, various clubs, etc.
There are new restrictions on the number of mids permitted in each activity and restrictions on the number of activities in which a mid may participate.
ECA movement orders may only commence during authorized liberty time depending upon class rank.
In short, I would not expect to see musical groups flying about the country and reprsenting the Academy. Musical groups no longer seem to be the "face of the Navy."