Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/16
Q:1/8=240
M:2/4
K:C
['[eD,]f[gG,]e[dG,]2[dG,]2 [GG,]2[BG,]2[dG,]2[dG,]e', '[GG,]B[GG,]B[BG,]2[AD,]2 [AD,]c[AD,]c[cD,]2[BG,]2 [eD,]f[gG,]e[dG,]2[dG,]e']  
X:1
L:1/16
Q:1/8=240
M:2/4
K:C
|: [GG,]2[BG,]2[dG,]2[dG,]d |[K:G] [eD,]f[gG,]e[dG,]2[dG,]2 | [GG,]2[BG,]2[dG,]2[dG,]e | 
 [dG,]c[BG,]A[BG,]2[GG,]2 | [GG,]2[BG,]2[dG,]2[dG,]d | [eD,]f[gG,]e[dG,]2[dG,]2 | 
 [GG,]2[BG,]2[dG,]2[dG,]e | [dG,]c[BG,]A[GG,]2G,2 :: [GG,]B[GG,]B[BG,]2[AD,]2 | 
 [AD,]c[AD,]c[cD,]2[BG,]2 | [eD,]f[gG,]e[dG,]2[dG,]e | [dG,]c[BG,]A[BG,]2[GG,]2 | 
 [GG,]B[GG,]B[BG,]2[AD,]2 | [AD,]c[AD,]c[cD,]2[BG,]2 | [eD,]f[gG,]e[dG,]2[dG,]e | 
 [dG,]c[BG,]A[GG,]2G,2 :|  