Buttermilk is primarily due to lactic acid produced by lactic acid bacteria while fermenting lactose, the primary sugar in milk. As the bacteria produce lactic acid, the pH of the milk decreases and casein, the primary milk protein, precipitates, causing the curdling or clabbering of milk. This process makes buttermilk thicker than plain milk. While both traditional and cultured buttermilk contain lactic acid, traditional buttermilk tends to be less viscous, whereas cultured buttermilk is more viscous. Buttermilk can be drunk straight, and it can also be used in cooking. Soda bread is a bread in which the acid in buttermilk reacts
Irish traditional music The most common instruments used in Irish traditional dance music, whose history goes back several hundred years, are the fiddle, tin whistle, flute and Uilleann pipes. Instruments such as button accordion and concertina made their appearances in Irish traditional music late in the 19th century. The 4-string tenor banjo, first used by Irish musicians in the US in the 1920s, is now fully accepted. The guitar was used as far back as the 1930s first appearing on some of the recordings of Michael Coleman and his contemporaries. The bouzouki only entered the traditional Irish music world in the late 1960s.