Craft a musical piece that integrates the provided melodic theme and the corresponding alphabetical pattern.
X:1
L:1/8
Q:1/8=180
M:4/4
K:D
['', 'FD (3DDD', 'd2 eg']  
X:1
L:1/8
Q:1/8=180
M:4/4
K:D
 AG |: FD (3DDD FD (3DDD | EA, A2 EA, A2 | FD (3DDD DFAF | GBec dBAG | FD (3DDD FD (3DDD | 
 EA,A,G, (3A,B,C DE | (3FGF DF DFAF | GBec d3 || A | d2 eg fdfd | eAce dcBA | d2 eg fedf | 
 eAce dAFA | d2 eg (3fga fd | (3efg ec dcBA | a3 f gfeg | fedf ecAG"_DC" |]  