Create music using the given musical theme and adhere to the outlined letter-based structure.
X:1
L:1/8
M:4/4
K:G
['', 'B2 Bc', 'd2 dc']  
X:1
L:1/8
M:4/4
K:G
 Bc |: d2 de dcBA | B2 Bc B2 cB | BAAB c2 BA | cBBA B2 Bc | d2 de dcBA | B2 Bc B2 cB | 
 BAAB c2 BA |1 GDEF G2 Bc :|2 GDEF G2 FG ||[K:D] A2 AB AFAd | f2 fe d2 cd | e2 ed c2 Bc | 
 d2 cB AFGB | A2 AB AFAd | f2 fe d2 cd | e2 ed c2 Bc |1 d2 dc d2 FG :|2 d2 dc d2 ||  