What do you mean, what were Greek plays called? They were and are called plays. Most of them were tragedies, if that's what you mean.
the first plays to be called comedies or tragedies would be the greek plays
They're generally called Shakespeare's plays. Sometimes they are called by the type of plays they are: histories, tragedies and comedies. That's how they are referred to in the First Folio, the first compendium of the plays.
Because they are plays with passion
A keyboardist, a person who plays Piano is a Pianist.
They are called Musicals.
When everyone plays music together, it is normally called an orchestra.
A musician who plays the oboe is an oboist.
They're called rehearsals.
it is called a rerun.
A "harmonicanist" is what a person who plays the harmonica is called.
cellist