They (GNR) are mentioned in an article called, "Rock on Wood", by David Simmons, 
beginning on Page 44.  The opening text says, "The acoustic guitar has 
been a cornerstone in the construction of rock and roll since the late 
Fifties, strummed by everyone from Elvis and the Everlys to Incubus and 
Dave Matthews.  Led by your hosts Jack Black and Kyle Gass of Tenacious D  
-- a band that, as you know, makes all other acoustic rock acts 
irrelevant by comparison-- we take a trip back through the decades of 
acoustic guitar to explore how the instrument has shaped some of our
generation's best rock."

Jack and Kyle offer their insights of the artists mentioned by the author
 of the article for each decade.  We jump to page 96, where, after an 
introduction of "the '80s", on Page 52, "The D Free-Associates!  
Jack and Kyle on the Eighties", giving their impressions on this 
list of '80's artists, Tom Petty, John Mellencamp, Bon Jovi, Extreme, 
Poison, Guns N' Roses, and Tesla.  Guns' text reads:

"Guns N' Roses
Essential songs: 'Patience,' 'Used to Love Her', 'One in a Million'
Guitarist:  Slash, Izzy Stradlin'
Guitars:  Guild 6- and 12-strings
Influences:  Aerosmith, Led Zeppelin, Joni Mitchell, Erik Satie
Overview:  In 1987, felonious punks Guns N' Roses emerged with a 
sleaze-rock masterpiece, 'Appetite for Destruction', which yielded the 
hits 'Paradise City', 'Sweet Child O' Mine', and 'Welcome to the 
Jungle.'  'Appetite' ascended to Number 1, and GN'R became infamous-- 
known equally for their limitless debauchery as for their 
Aerosmith-influenced arena rock.  Following 'Appetite', the band 
released 'GN'R Lies', which combined their first EP 'Live?!*@ Like a 
Suicide' (1986) with four unplugged songs.  On 'Patience', Slash and 
Stradlin played ringing cowboy chords while Axl sang (and whistled!) 
of romantic fortitude.  But while 'Lie's' acoustic settings showcased 
gentler music, the band's inflammatory side was also in effect; on the 
controversial 'One in a Million,' they slandered African-Americans, 
homosexuals and immigrants (even though Slash is half-black, half Jewish 
[sic]), further cementing their rotten reputation.
  
The D Says:  'One of the greatest debut rock albums of all times.'
Kyle:  'Slash's riffs are all off the hook.  Every kid on earth bought 
a guitar because of that guy!'
Jack:  ' 'Patience was a nice little strum-along, though there wasn't 
anything special going on, except when Axl sings, 'A little patience!' ' "