Hi Paul, I ran the query you mentioned :
http://developer.echonest.com/api/v4/artist/terms?api_key=N6E4NIOVYMTHNDM8J&id=ARH6W4X1187B99274F&format=json
but there's no mood info in the results. Only styles/genres like rock, alternative,jazz, etc..
Can you please tell us how to retrieve the moods for a specific artist ? Thanks in advance,