Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:2/2
K:G
['TA2 EB', 'gdgb gdgb']  
X:1
L:1/8
M:2/2
K:G
 B | GDGB TA2 EB | GDGB GDGB | cABG TA2 EB | GDGB degd | (e/f/g) (f/g/a) TA2 EB | 
 GB/c/ (d/c/B/A/) G2 G :: f/g/ | gdgb agea | gdgb gdgb | gdgb Ta>gea | fede degd | 
 (e/f/g) (f/g/a) TA2 EB | GB/c/ (d/c/B/A/) G2 D :|  