Request from Turkey. Level 3 (intro), level 5 (chorus). Chorus played at tempo @4:38. Those Were the Days is Gene Raskin's adaptation of the Russian song, composed by Boris Fomin (1900–1948) with Russian lyrics by the poet Konstantin Podrevskii.

https://sites.google.com/site/pianoandmathtutorials/those-were-the-days

Jane, a retired university math teacher, started this volunteer project in April 2009. Positive feedback from wonderful viewers worldwide keeps her motivated. Jane is a strong advocate of reading music. She made unconventional sight-reading lessons that simplifies reading music.

https://sites.google.com/site/pianoandmathtutorials/sight-reading-lessons