Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/8
Q:3/8=100
M:6/8
K:G
['dBB efg', '', 'G dBB eBB', 'G (B/c/d)G ceG', 'G2 B', 'G d3 e3', 'G g<dd g<ee'  
X:1
L:1/8
Q:3/8=100
M:6/8
K:G
 B | dBB efg | dBB B2 G | dBB efg | dBG A2 G | dBB efg | dBB B2 G | A2 B cde | dBG AG :|"^NB1" z |: 
 dBB eBB | dBB B2 G | dBB eBB | dBG A2 G | dBB eBB | dBB BAG | A2 B cde | dBG A2 G :: 
 (B/c/)dG ceG | (B/c/d)G B2 G | (B/c/d)G ceG | dBG A2 G | (B/c/d)G ceG | dBg B2 G | A2 B cde | 
 dBG A2 G :: G2 B G2 B | G2 B B2 G | G2 B G2 B | BgB A2 G | G2 B G2 B | G2 B BAG | A2 B cde | 
 dBG A2 G :: d3 e3 | d3 B2 G | d3 e3 | dBG A2 G | d3 e3 | d3 BAG | A2 B cde | dBG A2 G :: 
 g<dd g<ee | gdd B2 G | g<dd g<ee | dBG A2 G | g<dd g<ee | g<dd BAG | A2 B cde | dBG A2 G :|  