Final answer:
In October 1977, Lynyrd Skynyrd's Ronnie Van Zant, Steve Gaines, and Cassie Gaines died in a plane crash, which is considered a significant event in rock history.
Step-by-step explanation:
In October 1977, members of the Southern rock band Lynyrd Skynyrd, including lead vocalist Ronnie Van Zant, guitarist Steve Gaines, and backup singer Cassie Gaines, tragically died in a plane crash. The band was traveling between shows on their tour when their plane ran out of fuel and crashed in a heavily forested area in Mississippi, leading to the loss of three band members and injuries to others on board. This event had a profound impact on the band and the music world, marking a significant moment in rock history.