Create musical composition by adhering to the given musical structure represented by letters and integrating the given motif.
X:1
L:1/8
Q:1/2=100
M:2/4
K:C
['C GDGA B2 B2 AGAB c2 c2', 'GA B2 AG aA AB c2 BA']  
X:1
L:1/8
Q:1/2=100
M:2/4
K:C
 C |[K:G]"^W Calvert" GDGA | B2 B2 | AGAB | c2 c2 | GABc | dedB | cAdB | G2 G2 :: gG GA | B2 AG | 
 aA AB | c2 BA | GABc | dedB | cAdB | G2 G2 :|  