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
['GB dd dB GG AB c>B A2']  
X:1
L:1/8
M:4/4
K:G
 DD GG BB A2 | cc BG AA G2 | z G GB dd dB | GG AB c>B A2 | GG GB dd dB | GG AB c>B A2 | 
 G2 z A AA Ad | cB AG AB A>A | E2 D2 z D DD | GG BB AB cd | BG A2 G2 z2 |]  