Generate a piece of music. The title is Duncan Gray.  
X:1
T:Duncan Gray
T:Duncan Gray
C:Music21
L:1/8
M:2/2
I:linebreak $
K:G
V:1 bass 
V:1
 DGFG AB F2 | G>GA>c BG G2 | DGFG AB F2 | G>GA/B/c/A/ BG G2 | Bddc/B/ cc c2 | Bc/B/AG FE D2 | %6
 DGFG AB F2 | G>GA>c BG G2 || %8  