For each artist, count how many songs.
select t1.artist_name, count(*) from artist as t1 join song as t2 on t1.artist_name = t2.artist_name group by t1.artist_name
What is the country of origin for the artist who made the least number of songs?
select t1.country from artist as t1 join song as t2 on t1.artist_name = t2.artist_name group by t2.artist_name order by count(*) limit 1