Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:3/4
K:A
['ef e>d (c/B/A/c/) ea ce a2', 'ce df ba gf ed fd AG']  
X:1
L:1/8
M:3/4
K:A
 ef e>d (c/B/A/c/) | ea ce a2 | f2 Be ge | a(e c)e a2 | ef e>d (c/B/A/c/) | ea ce a2 | fd Be gb |1 
 a4 z2 :|2 a2 z e (3(f=gf) |]:[K:D] ed f(d A)G | GF FE FA- | Ac eA ce | df ba gf | ed fd AG | 
 GF FE FA- | Ac eA ce |1 [Ddf]4 (3(fgf) :|2 [Ddf]4 z2 |]  