What instruments does the musician with last name "Heilo" use?
select distinct instrument from instruments as t1 join band as t2 on t1.bandmateid = t2.id where t2.lastname = "Heilo"
How many instruments are used?
select count(distinct instrument) from instruments as t1 join band as t2 on t1.bandmateid = t2.id where t2.lastname = "Heilo"