Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
Q:1/8=180
M:6/8
K:D
['(3A/B/c/ dAd AdA dc=c B2', 'gBg BgB fAf AfA']  
X:1
L:1/8
Q:1/8=180
M:6/8
K:D
|: (3A/B/c/ | dAd AdA | dc=c B2 B | eBe BeB | edc d2 (3A/B/c/ | dAd AdA | dc=c B2 g | fed cBA | 
 B=c^c d2 :: (3A/B/c/ | gBg BgB | fAf AfA | eGe GeG | de=f ^f2 f | gBg BgB | fAf AfA |1 eGe gfe | 
 d2 d d2 :|2 eGe ABc | d3- d2 ||  