Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
Q:1/2=54
M:2/2
K:F
['c2 dc']  
X:1
L:1/8
Q:1/2=54
M:2/2
K:F
|:"F" F3 G A2 BA |"C7" G2 AG"F" F2 C2 |"F" A3 B c2 dc |"C7" B2 cB"F" A4 :|"F" c2 dc d2 c2 | 
"C/E" c2 dc d2 c2 |"Cm/Eb" c2 dc d2 c2 |"Bb/D" c2 dc d2 c2 |"F/C" c3 B"F" A2 F2 |"C7" G3 A"F" F4 |]  