Generate a piece of music. The title is Mary's Dream.  
X:1
T:Mary's Dream
T:Mary's Dream
C:Music21
L:1/8
M:4/4
I:linebreak $
K:G
V:1 bass 
V:1
 B>c | d2 G>A G2 B>c | d>c de d2 B>c | d2 G>A G2 AB | cB AG F2 B>A | G3 F F2 DF | B>c cd/e/ d2 cB | %7
 cd fg d3 c | B2 A>G G2 d>f | g3 f ed cB | c2 d>f f2 df | g3 f ed cB | B3/2c/4d/4 c/B/A/G/ F2 B>A | %13
 G3 F F2 DF | B>c c3/2d/4e/4 d3 c/B/ | cd fg d3 c | B2 A>G G2 x2 || %17  