Create a musical composition employing the given alphabetic structure and melodic theme.
X:1
L:1/8
M:4/4
K:F
['F2 FG A2 AB c2 dc A4']  
X:1
L:1/8
M:4/4
K:F
"F" F2 FG A2 AB |"F" c2 dc A4 |"C" c2 BA G4 |"C7" B2 AG"F" F4 |"F" F2 FG A2 AB |"F" c2 dc A4 | 
"C7" c2 BA G2 AG |"F" F4 z4 |]  