The song "Bohemian Rhapsody" by Queen was originally released on October 31, 1975. It was the lead single from their album "A Night at the Opera" and became one of the most iconic rock songs of all time.
There is also a 2018 biographical film titled "Bohemian Rhapsody," which premiered in the UK on October 23, 2018, and had a wider release shortly after. But the original song release date is October 31, 1975.