La la la la, la la la...

Let's start this in 1976 (emphasis mine):

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Stevie Wonder nearly swept all possible Grammys he was eligible for. Winning for Best R & B Artist, Best Album, Best Song, Best Male Vocal, etc., Stevie amassed numerous awards and was recently awarded the Grammy's Lifetime Achievement Award. While in-between albums in 1976, Paul Simon in his acceptance speech for winning the Album of the Year Grammy jokingly thanked Stevie Wonder for not releasing an album that year. Stevie in fact did not release an album during that period because he was working on what would be his masterpiece double album entitled Songs in the Key of Life, released in 1976.

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From searches of the Grammys website:

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GRAMMY Winner Jethro Tull (Ian Anderson, Martin Barre, David Pegg),artist.
Genre Rock
GRAMMY Category Best Hard Rock/Metal Performance Vocal Or Instrumental
Year 1988 - 31st Annual GRAMMY Awards
Title of the Work Crest Of A Knave
Artist Performing Work Jethro Tull

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GRAMMY Winner Metallica (Kirk Hammett, James Hetfield, Jason Newsted, Lars Ulrich),artist.
Genre Rock
GRAMMY Category Best Metal Performance
Year 1989 - 32nd Annual GRAMMY Awards
Title of the Work One
Artist Performing Work Metallica

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From Dancing About Architecture (again, emphasis mine):

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And The Best Heavy Metal Performance Goes To ... a Flautist? - It was surprising enough when Jethro Tull's album Crest of a Knave was nominated in the Grammy's best hard-rock/metal category, but it was shocking when their album won the Grammy, beating out the likes of Metallica. Why the Tull album was even on the ballot remains a mystery. A few years later Metallica did win a Grammy, and during their acceptance speech thanked Jethro Tull for not releasing an album that year (tongue in cheek, of course), though Tull actually had released one.

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Listen to track 2, "The Memory Remains," on the 1997 Metallica album "ReLoad." The section of the song that I mistakently claim was Tull-influenced is not included in the 30 second song sample. The official lyrics do not list the la da das, but Lyricsfreak says:

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Nananananana nananada nananananana nanananadana
Nananananana nananada nananananana nanananadana

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From the Ontario Empoblog