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+### Base
+
+* Users can create Playlists.
+* Songs can be added to Playlists.
+* Songs are represented by one or more Sounds.
+  * This part isn't required, but I think it's useful
+    * prevents duplicate Songs
+    * allows for a fallback if a single Sound gets taken down for whatever reason
+    * gives flexibility for if a user has a preferred audio source (e.g. premium spotify account)
+* Reordering playlists will take O(n) time to replace the `index` field for each Song. I couldn't find a better representation for playlists. We can worry about perf later.
+
+```
+Song
+    id
+    title
+    artist
+    album
+
+Sound
+    id
+    song {Song}
+    type # e.g. youtube, soundcloud, mp3
+    location # used with type to locate the sound
+
+Playlist
+    id
+    user {User}
+    name
+
+SongInList
+    id
+    playlist {Playlist}
+    song {Song}
+    index # int for where song is in the list
+
+User
+```
+
+### Optional
+
+```
+Profile
+    id
+    user
+    blurb
+    facebook
+    twitter
+
+SongUserData
+    id
+    user {User}
+    song {Song}
+    rating
+    time_added
+    num_listens
+```