The accordion is a type of musical instrument that is made up of several components. The term 'tejano' refers to a style of Mexican-American music that is often played on the accordion. The concertina is a type of accordion that has buttons instead of keys. PLEAT and PLEATS refer to the folds in the bellows of the accordion. Keys are the buttons or levers that are used to play the notes on the accordion. Reeds and REED refer to the metal plates that vibrate when air is pushed through them, producing sound. Polkaed is a term used to describe a type of dance music that is often played on the accordion. Finally, the term 'squeezebox' is another name for the accordion.