A saxophone is a family of musical instruments that are made of brass. These are often just called a "sax". It has seven main keys, including the octave key. Because it is made from brass it is often included in the brass section alongside true brass instruments like the trumpet or trombone. However, it is not a true brass instrument but a member of the woodwind family of instruments because it has a reed. It was developed from the clarinet and shares many similarities to the clarinet. The player blows into a reed fitted into the mouthpiece of the instrument. Adolf Sax creates the instrument, but at first, it was heavily disliked because he boasted about it. Conductors would not add it to their orchestras because of the horrible reputations it had because of Adolf Sax. It started to gain popularity and lose that bad review, in the early 20th century.