Add NOTES

NOTES.md

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+# working notes
+
+- constructing artist catalogs from musiscbrainz api calls may be prohibitive
+  - musicbrainz requests that a single source IP not make more than 1 QPS
+  - going from artist name -> artist ID -> artist catalog requires making a linearly scaling number of requests with catalog size (some 20 requests for Taylor Swift, potentially) due to pagination
+
+- alternatives to musicbrainz api
+  - another api, like apple music
+    - expensive
+  - aggressive local caching with redis
+    - still incurs startup cost to warm up cache
+  - use a local copy of the musicbrainz database
+    - manage postgres instance? copy data into sqlite?