Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/8
M:4/4
K:C
['[M:6/8][K:G] Fe e Cae[Q:1/8=348] z4', '[BG,] [BG,,]A[GG,]', '[BG,,]2 G, [BG,,]A[GG,]']  
X:1
L:1/8
M:4/4
K:C
[M:6/8][K:G] !>!a Fe e Cae[Q:1/8=348] z4 z D |: [GG,,]2 [BG,] [BG,,]A[GG,] | 
 [DG,,]2 [BG,] [BG,,]A[GG,] | [EC,,]2 [cC,] [cC,,]A[GC,] | [FD,,]A[dD,] [DD,,]E[FD,] | 
 [GG,,]2 [BG,] [BG,,]A[GG,] | [DG,,]2 [BG,] [BG,,]A[GG,] | [EC,,]G[cC,] [FD,,]A[dD,] | 
 [AD,,]G[FD,] [GG,,]2 [DG,] :: [BG,,]2 G, [BG,,]A[GG,] | [BG,,]2 [gG,] [gG,,]d[BG,] | 
 [cC,,]2 [gC,] [gC,,]d[BC,] | [cD,,]2 [cD,] [AD,,]B[cD,] | [BG,,]2 G, [BG,,]A[GG,] | 
 [BE,,]2 [gE,] [gE,,]d[BE,] | [cC,,]2 [cC,] [AA,,]2 [AA,] ||1 [AD,,]G[FD,] [GG,,]2 [DG,] :|  