The crossword solution for the term 'Oboe or Bassoon' is 'REED'. A REED is a thin strip of material, usually made of wood, metal, or plastic, which vibrates to produce sound when air is blown through it. Oboes and bassoons both use a double REED, which consists of two pieces of cane tied together at the base. The REED is placed in the instrument's mouthpiece and vibrates when the musician blows air through it.