First of all, on Jan. 5 trueboltsfan translated the second film in the "Prostokvashino" ("Buttermilk Village") series (animator.ru profile here).
This series is very much in the mainstream genre of popular Soviet animation from the 1970s-1980s; in general, some films are more the product of a director's personality while others are more representative of popular taste at the time, and this is one of the latter. The music, especially, is really a part of those years (I love it!).
The first film in the series (made in 1978) should be watched first, of course. MiaRossa translated it on June 10, 2008 (link), and trueboltsfan made another translation on May 12, 2009 (link).
The second film was made in 1978:
The films were directed by Vladimir Popov and based on the books by Eduard Uspenskiy.