Compose melodious music utilizing the prescribed letter representation and integrating the given thematic element.
X:1
L:1/8
M:3/4
K:F
['II, 50a + c4 (3def c2 B2', '(3cde f2 F2']  
X:1
L:1/8
M:3/4
K:F
"^vgl. II, 50a + Sec" c4 (3def | c2 B2 A2 | CG F2 E2 | F4 G2 | AFcAGF | Gc=Bd c2 | (3def e2 d2 | 
 c6 :: G4 (3GAB | AG F2 c2 | d2 bagf | f2 e2 (3cde | f2 F2 (3cde | f2 F2 c2 | dfcABG | F6 :|  