Tubular woodwind instruments are those that have a tube-like shape and are played by blowing air through them. The two most common examples of tubular woodwinds are the OBOE, which has four letters, and the fippleflute, which has eleven letters. The OBOE is a double reed instrument with a conical bore, while the fippleflute is a single reed instrument with an internal duct. Both instruments produce a unique sound that is often used in classical music, jazz, and other genres.