Answer:
Russian folk and revolutionary songs
Step-by-step explanation:
An air is a composition that is usually tied to folk songs and ballads. Here it refers to the Russian folk songs and those which speak of the revolution.
Revolutionary songs are those which carry the political message of rebellion and fight against the establishment. During the revolution, Russians had many songs singing about the hard life, hunger, and fight of the people. Dubinushka is an example of that kind of song. It was sung by workers and it talks about the hard labor they have to get through the day.