In the WeChat official account.

Rhythm Master’s new song laboratory is located in Rhythm Master’s official WeChat public account “Music World Rhythm Master”. You can find it through the following steps: Search and follow the official official account of "Music World Rhythm Master" on WeChat; after entering the official account, enter the keyword "Lab" in the chat box and reply "Yes". Follow the system prompts and you will successfully enter the new song laboratory interface.