Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
M:2/2
K:G
['G/A/B/c/ dB cedG AB cB/A/', 'G2 gg gb/g/ ee e2 aa aa/g/fd']  
X:1
L:1/8
M:2/2
K:G
 G/A/B/c/ dB cedG | AB cB/A/ GFGD | G/A/B/c/ dB cedG | AB cB/A/ GF G2 :: gg gb/g/ ee e2 | 
 aa aa/g/fd d2 | geea fddg | ecAd BG G2 :|  