Except Pandarens and Tinkers wound up as heroes in Warcraft. The Bard did not.
If you're basing a class on ETC, it is.Heavy metal isn't required as well.
Your comparisons continue to be terrible. The Brewmaster is based on Drunken Kung Fu, so despite the use of alcohol, the spec is STILL based on martial arts. Additionally, every spec in the Monk class brews beverages. Thus it aligns just fine with the other two specs which are also based around martial arts and brewing.You could have a Bard class that plays out all the mainstay high fantasy Bard tropes, and have a spec or a couple abilities that reference Heavy Metal, and that would be enough to completely play out that fantasy as well. Just like Brewmaster doesn't have 100% abilities that all deal with Alcohol abilities. It's like 90% martial arts, 10% Alcohol/Keg-related abilities.
However, a class where one spec is playing a lute or a harp and playing medieval tunes doesn't work very well with a spec wearing glam rock outfits and playing heavy metal rock music. We also have the rather major problem that we have no examples of any such heroes existing in the history of Warcraft.