Final answer:
In 1986, the Beastie Boys and Run DMC brought together Hip-Hop and Rock in a groundbreaking collaboration.
Step-by-step explanation:
The successful 1986 collaboration between Beastie Boys and Run DMC expertly blended the genres of Hip-Hop and Rock music. This innovative crossover helped pave the way for future genres to merge, creating dynamic new sounds. The electric instruments characteristic of rock music, juxtaposed with the beats and powerful lyricism of hip-hop, resulted in a genre-defining collaboration that captured the spirit of rebellion and change prevalent in the music of that era.