At present, this is a classic example of a thing that does a thing. There's no real narrative development here, its just a guitar that destroys buildings and used to be owned by a rock star. Clinical tone is also rather lacking, as you frequently use colloquial language (e.g. "made back in").
The article overall is too short to develop its narrative. Short skips are fine, but not at the expense of narrative. You hint at several extraneous concepts like a like to the guitarist's aging but never follow up on them. When using -1 or -2 etc, each additional one is a different subset of the anomaly along with, rather than in place of, the original. Thus, it makes more sense for the guitarist to be -1 than -2.
Remember to think of skips as short stories first and magic items or events second. Try and find a twist on the basic theme or a story you can tell with the guitar as a catalyst. That and fixing the tonal issues should be your highest priorities.
