The room in which a musician or singer practices.

Normally sound proof or dampened, these tiny chambers of acoustical hell are often directly connected to one another making rehearsal with a metronome or privacy impossible. Many musicians spend their entire formative time in a practice room and as such have difficulty performing for people or listening in to the ensemble they are playing with.

The "practice room sound" is a syndrome that many young musicians fall prey to - it refers to not being able to adjust to your surroundings and always playing with the same timbre and interpretation you use while by yourself, in the practice room.

Also, a designated place for making out amongst high school band and choir students. Don't ask me why.