Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/8
Q:3/8=120
M:6/8
K:F
['CFA c2 A', 'c3 ceg b2 g fdf a2 g']  
X:1
L:1/8
Q:3/8=120
M:6/8
K:F
 CFA c2 A | CFA c2 A | CFA c2 A | GEC C3 | CFA c2 A | G=Bd f2 g | edc fed | .c-.c-.c c3 :: 
 ceg b2 g | fdf a2 g | fag fed | eA^c d2 e | faf cAF | CEG B2 c | AGF BAG | .F-.F-.F F3 :|  