Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:2/2
K:Dmix
['c AddA FDDF EcGc ECCA d2 AG', 'fddb adaf']  
X:1
L:1/8
M:2/2
K:Dmix
 c | AddA FDDF | EcGc ECCA | d2 AG FGAg | fdec d/d/d d :| e | fddb adaf | gcca gcge | fddb adaf | 
 gcge d2 dA | d/d/d df abaf | gcca gcge | dfeg fagb | afge d2 d ||  