Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/8
M:2/4
K:G
['dcBA G2 DD GGAA BBAA BBAA BBAc']  
X:1
L:1/8
M:2/4
K:G
 dcBA | G2 DD | GGAA | BBAA | BBAA | BBAc | BGAA | G2 z2 |]  