Actually, if you wanna use that analogy, the brand is actually the band each with their own version of the song (ice cream), a cover of the original (neither created chocolate ice cream, but it's a very popular flavor (song) like Ring of Fire that gets covered constantly). A new vocalist would be like a new or different ingredient, changing the taste/sound into something sorta new. If that makes sense.
This is amazingly in depth haha. And 100% accurate.