Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
M:2/4
K:C
['e2 c2 c/B/d/B/ GA/B/ cc dd', "ge c'a", '(eg) fd gB |1 c2']  
X:1
L:1/8
M:2/4
K:C
 e2 c2 | c/B/d/B/ GA/B/ | cc dd | e/f/e/d/ cG | e2 c2 | c/B/d/B/ GA/B/ | cc dd |1 c2 z2 :|2 
 c2 z G/^F/ |]: G=f ed | e2 cc | c/B/d/B/ GA/B/ | (c/B/)c/d/ cG/^F/ | G=f ed | e2 cc | 
 c/B/d/B/ GA/B/ |1 c2 z2 :|2 c2 z e/f/ |]: ge c'a | g2 (eg) | fd gB | c/B/c/d/ ce/f/ | ge c'a | 
 g2 (eg) | fd gB |1 c2 z2 :|2 c2 z B/c/ |]: d2 (G/^F/)G/A/ | e2 (G/^F/)G/A/ | [df][df] [ec][ec] | 
 [Gd][Gd] [Gd]e/f/ | ge c'a | g2 (eg) | fd gB |1 c2 z B/c/ :|2 c2 z2 |]  