The full score is sheet music that shows all the different instruments' parts, so the conductor can follow along and see who plays what when.
It's so the conductor can follow and keep track of every single part, to know who plays what and when.
the conductor
A Conductor.
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The score shows all the various parts on a single page, so the conductor knows what everyone is supposed to be playing.
The conductor typically follows a score during a performance.
The conductor uses a baton to direct an orchestra.
That would be the conductor, with the conductor's score.
A full musical score is a written form of the different instruments appears on separate staves on large pages. The opera score used by the conductor would also show the vocal scoring. There are many types of 'scores' and the link below will provide further information.
A majorette!
score
A conductors baton.
A conductor keeps track of the parts by studying the score first.