The music bot that received a Google cease-and-desist notice alongside Rythm in 2021 was Groovy.
Groovy let Discord users request songs and play audio from YouTube in voice channels. Google objected that the bot modified YouTube and used the service commercially, while also bypassing the advertising model that supports YouTube and its creators.
Groovy shut down on August 30, 2021, after reportedly serving more than 250 million users. Rythm, another major Discord music bot, followed after receiving its own notice and closed on September 15, 2021.
A common mix-up is confusing these music bots with Discord moderation bots such as Dyno, MEE6, and Carl-bot. Those bots perform administrative tasks; Groovy and Rythm were primarily used for music playback. Google’s notices targeted the way the music bots obtained and streamed YouTube audio, not Discord itself.