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
['G>A B2 B2 c2 c>d e>fe>d B2', '(3def g2 G2 e2 G2 e>fe>d B2']  
X:1
L:1/8
M:4/4
K:G
 G>A | B2 B2 c2 c>d | e>fe>d B2 G>B | d2 d>B A2 A>B | (3cdc B>A G2 G>A | B2 B2 c2 c>d | 
 e>fe>d B2 G>B | d2 d>B (3cdc B>A | G6 || (3def | g2 G2 e2 G2 | e>fe>d B2 G>B | d2 d>B A2 A>B | 
 (3cdc B>A G2 (3def | g2 G2 e2 G2 | e>fe>d B2 G>B | d2 d>B (3cdc B>A | G6 ||  