Is it possible to access the device music playlist and / or spotify playlist?

I am a complete beginner, so my apologies in advance if this is a basic question. I am looking to create a music experience app which will use the device's existing playlists or spotify. Is it possible to access either? and once accessed, can we control the playing of the list from our own app? If so, is there a tutorial or other documentation on how to do this?
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