Grade 10 at all restockable instruments

More expensive instruments:
Jug- grade 1
Erhu- grade 10
timpani drum- grade 1
accordion- grade 10
didgeridoo- grade 2
glockenspiel- grade 10
harmonica- grade 1
ocarina- grade 1
piano- grade 1
pear ukulele- grade 8

just need a banjo and trombone, then he is a level 1 troll killer