Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/8
Q:1/2=90
M:4/4
K:G
['d3 e dBgB', 'DGBG AGBG']  
X:1
L:1/8
Q:1/2=90
M:4/4
K:G
 d3 e dBgB | dBgB aAAB | d3 e dBgB | A/B/c BA BGG z :: DGBG AGBG | DGBG AGAB | DGBG AGBG | 
 dedc BGGB | DGBG AGBG | DGBG AGAc | BAGF GFED | EFGA BGG z :|  