a leader
Assembly would be a name for putting things together.
two people singing together is a duet
Some people can say things over the phone that they cant bring themselves to say in person...like..I love you or lets go out together again tomorrow...or lets go steady...things like that...other people just like to talk a lot and feel like they have company while on the phone.
guillotine
no
Quartet
A duet.
Choir
Scribe
gatherings or gathering
Well, different people call them different things. Some people call them Aqua Jumps, and some people call them Blobs!