Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
M:6/8
K:F
['Acc FAA CFF A,CC A,CC FAA FEE', 'dcc aff cff']  
X:1
L:1/8
M:6/8
K:F
 Acc FAA | CFF A,CC | A,CC FAA | FEE E2 C | CEE EGG | GBB Bcc |1 cee ecc | BAA A3 :|2 cee ede | 
 gff f3 :| aff cee | aee dcc | aff cff | fee e3 | gee cee | gee dcc | gee cee | dcc c3 | aff cee | 
 aee dcc | aff cff | fdd d3 | dBB FBB | CFF A,CC | cee ede | gff f3 |]  