The Choir Room, also known as The Music Room is the classroom at Hogwarts School of Witchcraft and Wizardry where the New Directions rehearse every day after the lessons, and in their free time. All their meetings have taken place there and so have most of the show. Many musical numbers have also been performed in the Choir Room along with classes.
This classroom features rows of music stands and stools, a drum kit, a piano and a conductor's stand as well as a blackboard on the wall. The room most likely held host to a mixture of both vocal and instrumental practises.