The notifications within your Songstream are updates on playlists and the authorities you have subscribed to or general app navigation tips. So, when a user makes any changes to the playlists you have subscribed to or, if an Authority you have subscribed to has added a new chart or playlist, you will receive a notification.
To stop notifications from other users’ activities, you may unsubscribe to them or their playlists.
To completely stop all notifications, including tips etc. ,you may use the toggle switch in the left menu bar to turn notifications on and off go to Settings -> Notifications -> App notifications -> Yonder
Here you may make the necessary adjustments to disable notifications.