Def Leppard's top 10 neighbors span hard rock bands, a comedian, a TV show, and two TV personalities — a mixed cluster compressed into a narrow similarity band running from 0.98 down to 0.93, which is the defining feature of a flat shape: no single neighbor dominates, and no clear gap separates the top from the bottom.
The two highest-scoring neighbors are fellow Musicians and Bands: Mötley Crüe at 0.98 and Nikki Sixx at 0.97. KISS (0.95), Avenged Sevenfold (0.94), and Aerosmith (0.94) round out the rock-band cluster. That's five of the top 10 sharing Def Leppard's own subcategory — the audience shape is substantially self-similar. The remaining five, however, pull in different directions. Jeff Dunham (0.97) is a Comedian, sitting just below Nikki Sixx despite having no obvious thematic connection to hard rock. Ghost Adventures (0.95) is a TV Show, and Aaron Goodwin (0.93) and Zak Bagans (0.93) are TV Personalities — both associated with paranormal reality television. Kailyn Lowry (0.93) is a Reality TV Star, the only one in the top 10. The paranormal TV cluster (one show, two personalities) is the most structurally unexpected element: three of the top 10 neighbors share that niche, scoring comparably to established rock acts.
The flat shape here reflects an audience that overlaps broadly with hard rock peers but also carries a consistent secondary signal in paranormal and reality TV content — a combination that keeps the similarity scores tightly bunched rather than spiked around any single neighbor.