Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
Q:1/4=116
M:2/4
K:G
['g2 gf/e/', 'B2 BA/G/ c/d/e/f/']  
X:1
L:1/8
Q:1/4=116
M:2/4
K:G
 g2 gf/e/ | fddf | g2 gf/e/ | fa-af | g2 gf/e/ | fd-de | dBcA | G/G/G G2 :: B2 BA/G/ | 
 c/d/e/f/ g2 | dB- BA/G/ | F/G/A/B/ AD | B2 BA/G/ | c/d/e/f/ ge | dBcA | G/G/G G2 |]  