minstrels' gallery

noun1

1. •
   A form of balcony, often inside the great hall of a castle or manor house, where musicians (originally minstrels) could perform, sometimes discreetly hidden from the guests below.

   • It was the earliest brick-constructed house of its size in Shropshire, and is complete with minstrels' gallery, ornate chimneystacks, and vast fireplaces. — 1980