Develop a musical composition using both the specified melodic theme and the alphabetical pattern naming.
X:1
L:1/8
M:2/4
K:C
['G, CG,A,G, G,2 z C B,CDB, C2']  
X:1
L:1/8
M:2/4
K:C
 G, | CG,A,G, | G,2 z C | B,CDB, | C2 z C/D/ | EEEF/E/ | DDDE/D/ | CCCD/C/ | B,B,B,C/B,/ | 
 A,G,A,G, | A,B,CD | E2 D2 | C2 z |]  