The concertina is a small, bellows-driven reed instrument, a smaller relative of the accordion. It is distinct because its buttons are on the ends of the instrument, and they move in the same direction as the bellows. There are two main types: the 'English' concertina (which produces the same note whether the bellows are pushed or pulled) and the 'Anglo' concertina (which produces different notes on the push and pull, like a harmonica). Because of its small size and durability, it was a favorite among sailors in the 19th century and played a major role in 'sea shanty' culture. It was also popular in Victorian high society and the Salvation Army. Today, the concertina is most famously used in Irish traditional music, where its crisp, articulate sound is perfect for fast reels and jigs.