Apple's Shazam app updated with new Pop Up functionality, but only on Android
In order to benefit from the new feature, you'll have to enable a new floating button that is overlaid on the screen. When the new button is enabled, you will see a persistent notification in the notification drawer, which can be used to trigger it. Whenever you wish to use Shazam to identify a song, simply tap on the Pop Up floating button.
Of course, you will be able to dismiss both the button and the persistent notification by simply dragging the button at the lower part of the screen to make it disappear. If you want to make the persistent notification go away, you will have to switch off feature from the Shazam settings menu or by swiping down the notification and tap on Turn Off.
The new Pop Up functionality is available in the latest version of Shazam for Android, which has already been uploaded in the Google Play Store. If you have the app installed, a new update should be available for download.