Question: I hope that this question follows the rules.

One of my characters has a kalimba that, when played, allows the player to hear the thoughts of everyone around them, and everyone around them can hear the player's thoughts. These thoughts can also control each other, so everyone involved can make each other do anything they want by telling them to do it through their thoughts, like mind control.

It's kind of like an addiction, though, and the more that you play it, the deeper you get in said "addiction". The idea of an addictive magical item sounds kinda familiar, though... (cough One Ring cough)... at least, to me, it does. (Note: All magic is addictive, and the higher magic something has, the more addictive it is.)

It only works if the correct three moons are in the sky (this world has multiple moons); otherwise, it's a completely normal kalimba.

Is this too cliche, or should I keep it as it is?

Answer: 
**It is *not* cliche:**

Like I mentioned in comments, every good idea has been used before. Just by using a vague idea (an addictive magical item) and it happens that a different book with a *different* plot has also used a similar thing doesn't make your idea cliche.

When you say "addictive magical item" cliche doesn't come to mind, at all.

So, as long as you research books with similar items to make sure your item is not too similar (which I doubt it will be) and then you make any necessary changes, you should be fine.

For example, just because [a book has a superhero character](https://www.google.com/search?surl=1&rlz=1CAXEGH_enUS894&ei=JvZHYNTHCMbK-gTSpYuICA&q=books%20with%20a%20superhero&oq=books%20with%20a%20superhero&gs_lcp=Cgdnd3Mtd2l6EAMyBggAEBYQHjoHCAAQRxCwAzoCCAA6CAgAEBYQChAeOggILhDHARCjAjoHCCEQChCgAVDKkgFYzPYBYLv5AWgKcAF4AIABxwSIAeEXkgEMMi4xMS4yLjAuMS4xmAEAoAEBqgEHZ3dzLXdpesgBBsABAQ&sclient=gws-wiz&ved=0ahUKEwjU8r3doKTvAhVGpZ4KHdLSAoEQ4dUDCA0&uact=5&safe=active&ssui=on) doesn't mean that no other book can have one.
[![enter image description here](https://i.stack.imgur.com/xXZQL.png)](https://i.stack.imgur.com/xXZQL.png)

Dog: You want to give me a belly rub. Bard: You don't want to bite the mailman.

Who will win?

The One Ring wasn't addictive, like how opium or tobacco induce a positive experience that repeated use turns into a dependence with diminishing returns.

The invisibility the Ring gave the wearer was addictive since it conferred a sense of power to the user. Repeated use of the ring let the will of Sauron try to corrupt you -- worked on Smeagol, but no so much on Bilbo, two characters that used the ring a lot, and did a number on Frodo despite only wearing the ring once.

I don't think your notion of an addictive magical item is cliche. But, it's hard for me to imagine how the Kamilba would be addictive. Because you lose control of yourself when you gain control over others. That doesn't give me a sense of good times or euphoric bliss that would make someone want to repeat the experience. You make your audience give you all their money and one of them makes you stick your head in the deep fat fryer.

The notion that it only works when 3 moons are in the sky seems like a convenient story mechanic used to explain away how someone gets addicted to playing the instrument without experiencing the cost of being mentally dominated by their audience.

If playing the kalimba gave the musician an empathic sense of the audience, then performance could be tuned to evoke the maximum experience in everyone listening to the music, creating a deep sense of connection between the performer and the audience. The audience would see the musician as the greatest of all time, and I could see the performer getting hooked on both the adulation and deep intimacy.