Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
M:4/4
K:G
['f>e c>A E2 e2 d>c A>F D>c', 'a2 g>e c>A ^G>A B>c']  
X:1
L:1/8
M:4/4
K:G
 g>a | b>gd>B G>Bd>g | f>e c>A E2 e2 | d>c A>F D>c B>A | G>A B>c d2 g>a | b>gd>B G>B d>g | 
 f>e c>A E2 e2 | d>c A>F D>c B>A | G2 B2 G2 ::[K:D] a2 | g>e c>A ^G>A B>c | d>e f>^g a2 b2 | 
 a>=ge>c A>gf>e | f>d A>F D2 a2 | g>e c>A ^G>A B>c | d>ef>^g a2 b2 | a>ge>c A>gf>e | d2 f2 d2 :|  