The term ENGLISH HORN RELATIVE refers to the OBOE, which is a four-letter word. The OBOE is a double-reed woodwind instrument that is part of the larger family of instruments known as the 'double reed' family. It is most commonly used in classical music, but can also be found in jazz and other genres. The OBOE has a distinctive sound that is often described as being mellow and haunting. It is also known for its ability to blend well with other instruments. The OBOE is related to the English horn, which is a larger version of the OBOE with a deeper, more resonant sound.