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
['A A>f f>A G>e eG', 'dF A2']  
X:1
L:1/8
M:2/4
K:D
 A |:"D" A>f f>A |"A7" G>e eG |"D" F>d dF | A2 A>F |"A7" G>c cG |1 B2 BG |"D" F>d dF | A2 z A :|2 
"A7" B2 BA | Ag fe |"D" dd d z |:"D" f/f/f/f/ ed |"A7" cb a2 | c'>a g/f/e/c/ |"D" db a2 | 
 f/f/f/f/ ed |"A7" cb a2 | c'>a g/e/c/e/ |"D" dd d"_Teil A" z ::"D" A>f f>A |"A7" G>e eG | 
"D" F>d dF | A2 A>F |"A7" G>c cG |1 B2 BG |"D" F>d dF | A2 z A :|2"A7" B2 BA | Ag fe |"D" dd d z |]  