Please refer to the following tutorial on how to use this free DRM Audio Converter on Android to record any playing music as MP3.
Download and Install Free DRM Audio Converter for Android
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How to Record Any Music to MP3 on Android?
Step 1. Before launching the program, please root your Android phones or tablets. Then launch the program. If you meet the "Failed got permission" problem, please open the Permission setting in your Android phone, and then find "Syncios Audio Recorder". Click to allow displaying pop-up window.
Step 2. Open a music app (default music player or Google Play, Spotify, Apple Music, etc.) and play a song. Then, tap on " " icon to start recording music. By clicking on the icon again to stop recording.
Note: Before converting, you can click the " " icon to set output directory and output audio bitrate. Alos, you can enable silence gap detecting while capturing stream music.
Step 3. After finished recording, you can click on " " to browse and paly back the audio files.