Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
Q:1/2=100
M:2/2
K:D
['fd d2 AF F2', 'fdad bdad']  
X:1
L:1/8
Q:1/2=100
M:2/2
K:D
 g | fd d2 AF F2 | E e2 ^d e2 eg | fd d2 AF F2 |"^cr" D d2 c"^qu" d2 d :| g | fdad bdad | 
 E e2 d (e2 e)g | fdad bdad | A (d2 c) d2 dg | fdad bdad | F e2 ^d (e2 e)g | fada gbeg | 
 A d2 c d2 d |]  