Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
Q:1/8=140
M:3/8
K:G
['B/c/ dGG GF (A/B/) cFF G2 G', '(d/e/) d2 (d/e/)']  
X:1
L:1/8
Q:1/8=140
M:3/8
K:G
 B/c/ | dGG | GF (A/B/) | cFF | G2 G | (GF)E | (DG)B | cA d | B2 (G/A/) | (G/F/)(A/G/)(F/E/) | 
 DG/B/d |{^d} eFF | G2"^fine" || (d/e/) | d2 (d/e/) | d2 (d/e/) | ddd | d2 D | DF/A/d/f/ | gg z | 
 ee/c/G/e/ | d2 d |{^d} eFF | GB/d/g |{^d} eFF | G2"^Da Capo" |]  