How many instruments have the musician with last name "Heilo" ever use?
select count(instrument) from instruments as t1 join band as t2 on t1.bandmateid = t2.id where t2.lastname = "Heilo"
List those instruments
select instrument from instruments as t1 join band as t2 on t1.bandmateid = t2.id where t2.lastname = "Heilo"