If you're listening to Pandora or a similar app that suggests songs based on what you like, you might already know a lot of bands that sounds like the Grateful Dead simply based on those recommendations. Maybe you've searched for some on your own, or maybe you're looking for some now. It's always nice to find new music you like, and if their sound is similar to The Dead (which, let's face it, isn't 100% possible, but they can be in the same ballpark!), they're bound to be enjoyable, right?
As far as classic rock artists, many suggest the Allman Brothers as one of your best bets when it comes to finding a close match, and they do have what is probably the closest sound. Other suggestions include Little Feat, Neil Young, Big Brother & the Holding Company, and even Santana. I'd have to argue that some of these are farther away from The Dead than closer, but I understand where the similarities are considered as well.
That leaves it up to you, Dead fans: who do you think is the closest sound to the Grateful Dead? Why?