Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:4/4
K:G
['GB B2 dGBd cdec dBGB ce e2', 'AGEG dg g2 edBd eaag agef gd']  
X:1
L:1/8
M:4/4
K:G
 GB B2 dGBd | cdec dBGB | ce e2 dBGB | A2 BG AGEF | GB B2 dGBd | cdec dBGB | ce e2 dBGB |1 
 ADFA G2 (3DEF :|2 ADFA GABc |: dg g2 edBe | d2 BG AGEG | dg g2 edBd | eaag agef | 
 gd (3Bcd ed (3Bcd | c2 Bc AGEG | c3 e dBGB |1 ADFA GABc :|2 ADFA G2 (3DEF ||  