Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:2/4
K:D
['Ad ed d>c c2 cg', 'F>e ed G>e ed fe']  
X:1
L:1/8
M:2/4
K:D
"^A""D" Ad ed |"A7" d>c c2 | cg Ag |"D" fd d/c/d | Ad ed |"A7" d>c c2 | cg B>c |"D" dd d z :: 
[K:A]"^B""E7" e/e/e B/B/B |"A" e/e/e c/c/c |"E7" g/g/g f/f/f |"A" e/f/e/d/ cc |"E7" e/e/e B/B/B | 
"A" e/e/e c/c/c |"E7" gf dB |"A" AA A"_>Teil A" z ::[K:G]"^C""G" dd g2 | BB d2 |"Am" EE A/B/c | 
"D7" DD"G" G/A/B | dd g2 | BB d2 |"C" ee"D7" A/B/c |"G" GB G z ::"^D""D7" F>e ed |"G" G>e ed | 
"D7" fe cA |"G" G/A/B/c/ dd |"D7" F>e ed |"G" G>e ed |"D7" fe f/e/c/A/ |"G" GG G z :|  