The term 'OBOE's Sound' can be summarized by the crossword solution 'REEDY', which is a five-letter word. The OBOE is a woodwind instrument that produces a REEDY sound, which is characterized by a vibrato-like quality and a nasal tone. This sound is created by the OBOE's double reed, which vibrates when air is blown through it. The REEDY sound of the OBOE is often used in classical music to create a haunting or melancholic atmosphere.