I ran a one-shot recently which was set in 1980s New York, where the party was a new wave rock band, all either straight bards or multiclassed bards, each with a different subclass. I didn't change any of the mechanics, so all had spell slots and such, but the flavor was very different, and because they were all bards, they all had to have thematically distinct sets of abilities.
The lead singer was a glamor bard, who had what I described as a "preternatural" charm; not quite supernatural, but more than a normal strong personality. Sort of a celebrity-based power to make people feel good and want to do what she said. The lore bard was the manager, flavored similarly, only preternaturally intimidating and/or able to insidiously undermine people's self-confidence, and used fear-based and psionic spells (with some things, like Haste, flavored as drugs). Basically a really skilled sociopath. Then there was a synth player who was a goth whispers bard (multiclassed with Arcane Trickster), who I flavored as a tech genius -- more or less the same type of flavoring as what
@Umbran described for his artificer (but electronic). Used illusions flavored as holographic projections, some thunder stuff, some divination from little cameras, etc. The only one that was explicitly magical was the guitarist, who was a Swords bard with Hexblade levels, as a result of making a pact with his sentient "axe".