The font draws inspiration from the 1920s and 30s—the "Jazz Era"—where typography became increasingly eclectic and dramatic.
Furthermore, the rise of "New Retro" branding—where breweries and burger joints want to look 100 years old on day one—ensures that fonts like WT Jazz will remain in designer toolkits for decades.
WT Jazz is part of a rich world of music-inspired typography, but it has a unique place among them:
These fonts are usually "display-only," meaning they look great at large sizes but lose legibility in body text. Flying Hippo Option 2: Jazz Notation Fonts (e.g., Finale Jazz)