The music played at milongas is mainly tango, tango vals, and milonga. Most milongas are held on a regular basis and they often begin with a tango class and sometimes a demonstration dance. In Helena, we have a monthly milonga on the third Saturday of each month. Cost is $9 for the evening.
Usually, three to four songs of a kind are played in a row (this is called a tanda) followed by a short musical break (called a cortina) to clear the dance floor and facilitate partner changes. The songs within a tanda are virtually always all tangos, all waltzes (vals) or all milongas. So if you start dancing to a milonga you can assume that the next couple songs will also be milongas. During the cortina leaders often escort the followers back to their tables.