there are some ver melodic metal bands that use flute sounds so, you are right, it's not so much about the particular instrument as the style. Nothing in JTs entire catalog is metal.
How well versed are you in Tull's entire catalog?
And again, I know it's not easy to do, but try to put into words what makes a piece of music metal. If anyone can do it, you can.
Let's put it this way.. I've never heard a single Tuyll song that made me stop and think how metal it is. I'm willing to listen to every suggestion yu can find but, IMO, Tull is not anything close to metal.
JT is strait up progressive classic rock. Now, sometimes classic rock and metal share similar qualities because they are both based on the blues and pentatonic scales... If you come to a different conclusion then mine the so be it.. But, I will give you this example:
Has JT ever used a riff that is essentially nothing more than single tone (generally in A or E) 8th or 16th notes? This may sound silly on the surface but you'll hear this same pattern in a lot of songs that can be labeled metal. for example:
When the lyrics kick in.
[ame=http://www.youtube.com/watch?v=_aIhh9nFYv4&feature=related]YouTube - Black Sabbath Paranoid[/ame]
Notice the beginning of this song
[ame=http://www.youtube.com/watch?v=E_WZkCgeXWk]YouTube - Cowboys From Hell - Pantera[/ame]
The entire chorus is a variation of this metal theme
[ame=http://www.youtube.com/watch?v=u5Snehl2bAk]YouTube - Iron Maiden: Run to the Hills[/ame]
if you listen closely, 2:12 at the refrain
[ame=http://www.youtube.com/watch?v=FxEd6Rqaixk]YouTube - Cannibal Corpse - Mummified in Barbed Wire[/ame]
almost the entire song is nothing but fast 8th notes that BARELY stray from the root E.
edit - triplets in 6/8.. my bad. same effect though.
[ame=http://www.youtube.com/watch?v=RZLfZkXYsp0]YouTube - anthrax - Belly of the Beast - Persistence of Time[/ame]
I think it's also important to remember that the term "metal" was not used to describe what eventually became metal in the 70s. Even Black Sabbath called their sound "Doom Rock" based on the lyric content and minor key signatures. They didn't look to start the genre that eventually became metal. Hell, you are right, a LOT of BS music is blues-tinged classic rock. However, their status as origin of the genre didn't dictate the direction of the sound that we have come to know as Metal any more than The Sugarhill Gang could have predicted Eminem.
All of this is wrapped up in Image too. I hate to reach for non-musical content but metal evolved out of blues -> rock -> punk and JT just never makes it past the punk of the late 70s. Often people forget that punk was the metal of the late 70s when they look back at who was the origin of Metal.
Ok. It's a friday.. enjoy the videos. If you disagree then fair enough and have a great weekend!