Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
M:6/8
K:G
['', 'G3 GAB A3', 'dBG B3 dBG ABA AGA B2 B']  
X:1
L:1/8
M:6/8
K:G
 D |: G3 GAB | A3 AB/c/d | edd gdd | edB dBA | G3 GAB | A3 ABd | edd gdB |1 AGF G2 D :|2 
 AGF G2 A |: B3 dBd | e/f/ge dBG | B3 dBG | ABA AGA | B2 B dBd | ege dB/c/d |1 g3 aga | 
 bgf g2 A :|2 g3 a3 | bge dBA ||  