Melbourne Ska Orchestra’s sharpness and humour are absolutely infectious. Thumping basslines and a gentle guitar upstroke keep their second album, Sierra Kilo Alpha, nimble and refreshing through its dozen songs. Tracks like “Vespa Ska,” “Sly Boots,” and “Sans Humanite” are cast in the traditional Jamaican style and will plaster a smile across the rudest of rude boys’ faces. MSO take the orchestra part of their name to heart, so the horns come in hot. Pull those old chequerboard boots from storage and get ready for some of that old moonstomping.