I believe that it is a Bass Guitar or cello or violin.
Greenday sings the song 21 guns.
Green Day sings 21 guns.
They may be talking about me, I own 21 guns, I don't know. :-)
21 for Hand Guns. 18 for Long guns.
Etronix
Woodwind.
the cello
largest
Compass
vadyopakaranam
a string instrument
The clarinet