Group Manager is managed primarily by Anthony Lannuzel.
It was created to answer a simple need: manage the group members presence in various events (concerts, rehearsals, etc.) of the season. On Group Manager each member tells whether he will be attending a concert, and the manager is notified directly of the number of people present for each section, and accompanying persons if any.
This main feature was followed by others, such as the ability to send emails to group members, share documents (scores, recordings, etc.).