There are a few ways to delete all music from Android devices. The first way is to use the “Settings” app and select “Music.” Then, select the “Delete music” option and confirm your deletion. The second way is to use the “Google Play Music” app and sign in with your Google account. Then, select the “Delete music” option and confirm your deletion. The third way is to use the “Music Manager” app on your device. This app can be found in the “Applications” folder on your device. Once you open it, you’ll see a list of apps that are installed on your device. Select one of these apps and then click on the “Delete music” button.