choir or orchestra is another word for music group
another word for large group is clan.
Another word for gather or collect is... handle or group together.
Another word for religious group could be "faith community" or "religious organization."
assai - very, in music
yes
Another word for study group is "learning circle" or "study session".
faction clique
group
A group of witches is a coven.
Perhaps you are looking for the Sound of Music.
well another word could be a party or a group
authorized