orchestra
The word 'orchestra' in Italian is used much the same as in English. It refers to a large group of instrumentalists, particularly string players, but also possibly including woodwind, brass, and percussion players, led by a conductor.
My favourite orchestra is about to perform.
In this statement, the speaker is saying that the orchestra they love the most is getting ready to put on a show or play some music.
The orchestra is tuning their instruments.
This sentence is used to describe a common practice in orchestras, where each musician adjusts the pitch of their instrument before a performance to ensure a harmonious sound.
I took violin lessons from my city's orchestra.
This sentence implies that the speaker received violin lessons from a teacher who is part of the orchestra in their home city.