Compose a piece of music following the specified structure and theme.
X:1
L:1/8
M:2/4
K:G
['B2 G2 AB c2'  
X:1
L:1/8
M:2/4
K:G
"G" DGGG |"D" FGAB"G" | GG"D"FD |"D" EF"G" G2 :|"G" B2 G2 |"Am" AB c2 |"D" A2 F2 |"G" GB d2 | 
"G" B2 G2 |"Am" AB c2 |"D" AAFF |"G" G2 z2 |]  