Utilize the alphabetic system of the specified musical pattern and the supplied melodic theme to create a piece of music.
X:1
L:1/4
Q:1/4=120
M:3/4
K:G
['([dB] [cA]) [BG]']  
X:1
L:1/4
Q:1/4=120
M:3/4
K:G
"^Maestoso, man non troppo lento." [GB,]2 [GB,] | ([GB,] [FA,]) [GB,] | ([AFD] [GE]) [AF] | 
 [BG]2 z | [BG]2 [BG] | ([BG] [cA]) [dB] | ([dB] [cA]) [BG] | [BG] [AF] z | [GB,]2 [GB,] | 
 ([GB,] [FA,]) [GB,] | ([AFD] [GE]) [AF] | [BG]2 z | [BG]2 [BG] | ([BG] [cA]) [dB] | 
 ([dB] [cA]) [BG] | [BG] [AF] z | [AF]2 [cA] | ([cA] [BG]) [AF] | [BG]2 [cA] | [dB]3 | [ec]2 [ec] | 
 ([dB] [cA]) [BG] | ([cA] [BG]) [AF] | [GG]2 z |]  