This is the theme song from the children's sci-fi TV series "Guest From The Future", adapted from the long-running series of books: Alisa Seleznyova.
https://www.youtube.com/watch?v=GJB_kRkwUOk
The lead actress was also in a film from the same series, which is MUCH better.
While most of us remember usenet from the 90s, it actually started in 1980, so that's 43 years.