Earlier this year, Spotify was granted a patent for speech-recognition tech that could potentially recommend music based on your “emotional state, gender, age, or accent.” Now, a coalition of more than 180 artists and human rights organizations has written Spotify a letter asking the company to publicly commit to abandoning the dystopian technology.

The letter, which is addressed to Spotify CEO Daniel Ek, demands that the music streaming company publicly declare it will “never use, license, sell, or monetize the recommendation technology.” Among the letter’s signees are notable musicians like Talib Kweli, Eve 6, Rage Against the Machine’s Tom Morello, The Moldy Peaches’ Kimya Dawson, DIIV, and several others.

In that initial letter, the group called on Spotify to abandon the technology and answer questions regarding how it planned to protect user data.

The coalition is asking for a public response from Spotify by May 18.