The Steamroller and the Violin (1962) on Netflix

Sasha (Igor Fomchenko) is a small boy. He lives alone with his mother in an apartment building and spends his time practising the violin. Other boys of about his age live in the same building, but they do not play with him, and instead bully him for being a musician. To reach his music lessons at the music school he has to run the gauntlet of the other boys in the building. Then one day he meets the driver of a road roller Seryozha aka Sergei (Vladimir Zamanskiy). It is re-surfacing the asphalt near the apartment building, while another building is being demolished nearby. As their friendship develops, at first Sasha watches Sergei repair the road roller, next he helps Sergei with tools, then he gets to ride the roller with Sergei, and ultimately Sergei teaches Sasha to drive the roller. For a short time, Sasha, the budding artist, finds a temporary respite with Sergei, a member of the proletariat. Sergei is the only (& seemingly the first) man in Sasha´s life.