Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
Q:1/4=120
M:4/4
K:D
['d/d/d d>d d>Ad>b', 'F>Ad>A B>AdA f>g']  
X:1
L:1/8
Q:1/4=120
M:4/4
K:D
 A | d/d/d d>d d>Ad>b | a<fe>f{c} B2 B>e | d/d/d d>d d>Ad>b | ab/c'/ d'f{f} a2 ab | aad'f afe>d | 
 (e/g/)(f/a/) (g/f/)(e/d/) a2 be | d/d/d d>d d>Ad>b | afe>f d3 || A | F>Ad>A B>AdA | 
 f>g (g/f/)(e/d/){c} B2 B3/2{c}d | F>Ad>A B>AdA | f>g (a/b/)(c'/d'/){b} a2 (ab/c'/) | 
 d'>c'ba b>agf | (e/g/)(f/a/) (g/f/)(e/d/){c} B2 TBe | d/d/d d>d d>Ad>b | afe>f d3 |]  