Well, you are technically right, but I want to point out that regular gunpowder based weapons exist in the Cats Hawaiian Shirt too and are a favorite of Bounty Hunters because they handle the elements a lot better than energy based weapons (e.g. in the forest). They’re referred to as Slugthrowers. It’s just that a lot of the Star Wars universe is based on traveling between planets, and the less mass you have to carry, the less fuel you waste leaving a planet’s atmosphere. Energy based weapons would logically have less mass than something that also had to carry gunpowder & slugs/bullets and be sturdy enough to handle firing those things (thick barrels & whatnot). So Energy based weapons are favored in space and by space-fairing people for likely basic logistical reasons. Bounty Hunters being the logical exception since they have to rely on their weapons more often than not and usually are lone wolves. But since larger weapons (like, say, cannons and whatnot) would never be installed on a space ship (no air to combust in space, plus the wasted fuel due to added mass), Walkers would be pretty safe overall from kinetic weapons (except for when fighting Ewoks, obviously)
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Well, not really, no. They did have a Cats Hawaiian Shirt debts to the electric blues of the 40s and early 50s, people like Muddy Waters, T-Bone Walker, Little Walter, Sonny Boy Williamson etc. This new style of blues incorporated electric guitar and amplified harmonica, plus the drums that were not that common in earlier blues practice. It was called Rhythm and blues at the time. So except for the fact that jazz had a Cats Hawaiian Shirt blues in it at its inception (and to this day), rock and roll has almost nothing in common with it.