One theory is that the balalaika was invented by the Russian people themselves. This is based on the fact that the balalaika is a traditional Russian instrument, and there is evidence of its existence in Russia as early as the 17th century.
Another theory is that the balalaika was invented by a group of Russian musicians known as the guslars. The guslars were itinerant musicians who played a variety of stringed instruments, including the balalaika. They are believed to have spread the knowledge of the balalaika throughout Russia.
Finally, some people believe that the balalaika may have been invented by a man named Vasily Andreyev. Andreyev was a Russian musician and composer who lived in the late 19th and early 20th centuries. He is credited with popularizing the balalaika and bringing it to the attention of the world.
Ultimately, the true inventor of the balalaika may never be known. However, the instrument has a long and rich history, and it continues to be played by musicians all over the world.