Android. Running a background application does not appear in the task manager.
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All running services are displayed in the list of running services in applications. I seriously hope you CANNOT hide them.
The icons should not appear in the main application menu. You can remove an icon from this menu without defining the icon / label in the manifest.
Your request sounds sketchy / shady.
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Most music player apps put the current notification in the notification bar. You can use it so that when a user taps on a notification, it opens your music player so that he can stop it.
With the new Notification APIs in JellyBean, you can get a notification with buttons on it so they can control it without opening the app.
Read them here: http://developer.android.com/design/patterns/notifications.html
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