Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/8
M:6/4
K:G
['B2 DGGA B2']  
X:1
L:1/8
M:6/4
K:G
 BDG |"G" B2 AB"C" cABG"G/B" DGGA |"G" B2 AB"D" cAdc"G" BGDG |"G" B2 AB"C" cABG"G/B" DGGA | 
"G" B2 AB"D" cAdc"G" B3 B |:[M:4/4] ABcd |"Am" e3 e"G/B" efec |"C" A3 G"D" ABcd | 
"C" e3 g"D" fgaf |1"G" gedc"D" BGAF |"G" G3 G :|2[M:6/4]"G" gedc"D" BGAF"G" G ||  