Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/16
M:2/4
K:A
['A2AB dcBA d2d2 d4 B2Bc edcB c2c2', 'A4 gefg a2e2c2A2 a2>b2 gefg a6 c2']  
X:1
L:1/16
M:2/4
K:A
 A2AB dcBA | d2d2 d4 | B2Bc edcB | c2c2 c4 | A2>B2 cBcA | B2>c2 dcdB | c2ce dcdB | A2A2 A4 :| 
 !fermata!a2>b2 gefg | a2e2c2A2 | a2>b2 gefg | a6 c2 | d2f2e2c2 | B2d2c2A2 | [DG]2[DG]2[CA]2[CA]2 | 
 [EGB]6 (3EFG!D.C.! ||  