The present invention relates to a music session support method, a musical instrument for music sessions, and a music session support program. A music session support method which enables each of players in a music session which is performed via a network to immediately recognize whether or not the other players are in the state of being able to participate in the session. A session support apparatus transmits sets of status information indicative of whether or not each of players is in a state of being able to participate in a session, and player identification information which identifies the players, to each of session terminals. Each of the session terminals which have received the sets of status information and player identification information causes a touch display thereof to display the status information for each of the players. The session support apparatus acquires a set of status transition information indicating that a player of at least one of the session terminals in which the detecting device has detected the performance preparatory operation has gone into the state of being able to participate in a session, and player identification information for a session terminal, from the session terminal. The session support apparatus transmits the acquired set of status transition information and player identification information to the session terminals. Each of the session terminals updates contents displayed on the touch display thereof, based upon the status transition information and player identification information transmitted from the session support apparatus.