`tasks.py`    luigi workflow for getting top n grossing artists for orchard and getting last.fm tags for them

`analysis.py`  weighted tf-idf analysis for similarity recs

`data.{in,out}` data folders (should be removed in the future)


must set environment var `$LASTFM_API_KEY` to run the LastFM load tasks

load: `python tasks.py LoadTopTags --local-scheduler`

analysis: `python tasks.py AnalyzeTagSimilarities --local-scheduler`