Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/4
Q:1/4=120
M:4/4
K:G
['D D G/>F/ G/A/ B']  
X:1
L:1/4
Q:1/4=120
M:4/4
K:G
"G" B B B/>A/ G |"C" A A A/>G/ E |"G" D D G/>F/ G/A/ | B B"D" A2 |"G" B B B/>A/ G | 
"C" A A A/>G/ E |"G/D" D D G/>F/ G/A/ |"D7" B A"G" G2 || B2 G2 |"C" G2 E2 |"G" D D G/>F/ G/A/ | 
 B B"D" A2 |"G" B2 G2 |"C" G2 E2 |"G/D" D D G/>F/ G/A/ |"D7" B A"G" G2 |]  