Answer:
1.violin
2.cello
3.guitar
4.viola
5.harp
6.clarinet
7.flute
8.trumpet
9.oboe
10.basoon
11.tuba
12.trombone
13.french horn
14.baritone
15.saxophone
16.bass drum
17.gong
18.timpani
19.maracas
20.cymbals
