Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/8
M:2/4
K:C
['GGcG EG C2 Gcce dBG z']  
X:1
L:1/8
M:2/4
K:C
 GGcG | EG C2 | Gcce | dBG z | GGcG | EG C2 | Gcce | dBG z | eccd/e/ | fd d2 | eccd/e/ | dB G2 | 
 c>BcE | FG C2 |]  