Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
Q:3/8=100
M:6/8
K:G
['c B2 G- GBG dBG Bcd efg', 'afd efg']  
X:1
L:1/8
Q:3/8=100
M:6/8
K:G
 c | B2 G- GBG | dBG Bcd | efg dBd | ecA A2 c | B2 G- GBG | dBG Bcd | efg dBg | dBG G2 :: d | 
 gdg gbg | gbg afd | efg dBd | ecA A2 f | gdg gbg | gbg afd | efg dBg | dBG G2 d | gdg gbg | 
 gbg afd | efg dBd | ecA A2 f | gdg bag | f>ed afd | efg dBg | dBG G2 :|  