Neil Young, the Grateful Dead, Elvis Costello and others have no Grammy, so why does Jethro Tull?

Neil Young, the Grateful Dead, Elvis Costello, Creedence Clearwater Revival, Pete Seeger, the Who, and Sly and the Family Stone have never brought home a Grammy. But look who has:
1958 Record of the Year goes to Domenico Modugno’s ”Volare” in a year that saw the Everly Brothers’ ”All I Have to Do Is Dream” and Danny and the Juniors’ ”At the Hop.”
1963 Still not getting it, Grammy voters award Best Rock & Roll Recording to Nino Tempo and April Stevens’ lush ”Deep Purple.”
1964 Even though the Beatles walk away with Best New Artist and Best Performance by a Vocal Group (for A Hard Day’s Night), Best Rock & Roll Recording goes to Petula Clark’s ”Downtown.”
1965 It was the year of ”Like a Rolling Stone” and ”(I Can’t Get No) Satisfaction,” but voters think Herb Alpert & the Tijuana Brass’ ”A Taste of Honey” is Record of the Year.
1967 Elvis Presley wins his first Grammy — for his How Great Thou Art gospel album.
1968 Many associate this year with the ”White Album” or Beggars Banquet, but Glen Campbell’s By the Time I Get to Phoenix is voted Album of the Year.
1972 Elvis Presley wins his second Grammy — for his He Touched Me gospel album.
1974 Olivia Newton-John’s diabetes-inducing ”I Honestly Love You” captures Record of the Year.
1978 New wave? What new wave? Best New Artist goes to A Taste of Honey (”Boogie Oogie Oogie”) over Elvis Costello and the Cars.
1982 As a result of Willie Nelson’s rerecording, ”Always on My Mind” wins the prestigious Song of the Year — even though it was written in 1971.
1988 Metallica seem a sure bet to walk off with the new award for Best Hard Rock/Metal Performance. And the winner is Jethro Tull, who haven’t played anything approximating either genre since the ’70s.