Which vocal type has the band mate with last name "Heilo" played the most?
SELECT TYPE FROM vocals AS T1 JOIN band AS T2 ON T1.bandmate  =  T2.id WHERE lastname  =  "Heilo" GROUP BY TYPE ORDER BY count(*) DESC LIMIT 1
SELECT TYPE FROM vocals AS T1 JOIN band AS T2 ON T1.bandmate  =  T2.id WHERE lastname  =  "Heilo" GROUP BY TYPE ORDER BY count(*) DESC LIMIT 1
[{'Nenhum': 'Nenhum resultado encontrado'}]