They missed at least two albums:
Buffalo Springfield, (re-issue 1967)
Buffalo Springfield was a short-lived yet highly original and influential folk-rock group that served as a springboard for the careers of Neil Young, Stephen Stills, Richie Furay and Jim Messina. In November 1966, Stills wrote the landmark song "For What It's Worth" after observing the Sunset Strip riots. The recording of this song was in December, and by March 1967, the Buffalo Springfield had a Top Ten Hit.(Wikipedia)
Without this no Crosby Stills, Nash & Young, no Woodstock?
Garth Brooks was the 1989 self-titled debut album by country music singer Garth Brooks. It featured his first ever single "Much Too Young To Feel This Damn Old", a top 10 success which put an independent cowboy singer, Chris LeDoux, into the mainstream due to the lyric "a worn out tape of Chris LeDoux", and three country #1's: "If Tomorrow Never Comes", "Not Counting You", and one of Brooks' most known songs, "The Dance".
Brooks was a phenomenal musical force in the 1990s. He had his chart breakthrough in 1989, having come apparently from nowhere, and was an immediate commercial success. Lacking the tall and lanky physical appearance typical of some male country stars, he successfully integrated pop and rock elements into his recordings and live performances. He soon began to dominate the country singles and country albums charts and quickly crossed over into the mainstream pop arena, selling records like no one else in country music ever had and exposing country music to a larger audience than previously thought possible. (Wikipedia)
Without this no Kenny Chesney, no Toby Keith (who I wouldn't miss), none of the current hillbilly rock stars.