Construct a musical composition following the given alphabetical structure and incorporating the specified motif.
X:1
L:1/8
M:4/4
K:C
['G c2 d cdef g8']  
X:1
L:1/8
M:4/4
K:C
|:"C" G c2 d cdef | g8 |"Am" aeed e2"Dm" fg |"E" e8 |"C" G c2 d cdef | g8 |1"Bb" fdc_B"Ab" _A2 cd | 
"C" c8 :|2"Bb" fddf"Em" e2 eg |"Am" a8 |"Am" e2 ag a2 e2 |"D" ^fged"Em" e2 e2 | 
"Bb" =fged"C" c2 ce |"D" d8 |"Am" ea ag a2"B" b2 |"Em" g^f g2- g2"A7" a2 |"D7" ^fged cdfe | 
"E" e8 |]  