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
['G B', 'd c', 'BAB c3 A2 B cdc BAB A3', 'B cBA dcB AG z E2 E', 'd/c/ B3/2 c/ B AGA (G3 G2)', 'B ABc ddG (F3 F2) D GAG', 'D G', 'D G']  
X:1
L:1/8
M:6/8
K:G
 D | G D G B G B | d3 c2 G/A/ | B c B A G A | G3 z2 D | G D G B G B | d3 c2 G/A/ | B c B A G A | 
 G3 z2 B | d B c d B d | e3 d BA | G B d d c B | B3 A2 B/A/ | G D G B G B | d3 c2 G/A/ | 
 B c B A G A | G3 z2 |][M:6/8][K:Bb] F | B A B d c d | (!fermata!f3 e2) d | d c B B A B | c4 z F | 
 B A B d c d | f3 e2 d | d e d c B c | B12 d | f3 f f f f | g3 e2 e | d e f f e d | (d3 c2) F | 
 B A B d c d | f3 e2 d | d e d c B c | !fermata!B8 |][M:6/8][K:A] E | AGA BAB | c3 A2 B | cdc BAB | 
 A3 z :| e3 e2 c | ded c2 B | cBA dcB | AG z E2 E | AGA BAB | c3 A2 B | 
 cd"^compare \" Bege d ucae c BAB | A2 |][M:6/8][K:G] D | G3/2 A/ G B A B | c (d2 d2) d/c/ | 
 B3/2 c/ B AGA | (G3 G2) :| c | Bcd dBc | e (c2 c2) B | ABc ddG | (F3 F2) D | GAG BAB | 
 c (d2 d2) c | BcB AGA | (G3 G2) |][M:6/8][K:F]"^Andante espressivo" C | FC F AF A | c3 B2 B | 
 A c A G F G |[M:6/8][K:G] F3 D | G D G B G B | d3 c3 | B d B A G A | (G3 G2) D | G D G B G B | 
 d3 c3 | B d B A G A | (G3 G2) || d | d B d d B d | e3 c3 | B c d{e} dcB | PB3 A2 D | G D G B G B | 
 d3 c3 | B d B A G A | G3 G2 z |]  