Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
M:4/4
K:C
['dcA AGE c2 A ABc dcA', 'd dcA']  
X:1
L:1/8
M:4/4
K:C
 BEA |[M:6/8][K:D]SOSOO .!fermata!PMTuCOMd | dcA AGE | c2 A ABc | dcA AGF | DGG GBc | dcA AGE | 
 c2 A ABc | dcA fga | gec d2 :: d | dcA f2 g | aag f2 d | dcA fga | g2 G GBc | dcA f2 g | 
 aag f2 d | dcA fga | gec d2 :|  