Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/8
M:6/8
K:F
['F2 G A2']  
X:1
L:1/8
M:6/8
K:F
 DD | F2 F F2 F | F3 A,2 B, | CCC C2 C | C3 F,2 F | GGG C2 E | G3 F2 G | A2 G FED | C3- C2 C | 
 FFF C2 C | F2 F A2 F | G2 G C2 E | G2 F EDC | D2 D B,2 D | C2 B, A,2 F, | C2 C(CD) E | F2 G A2 c | 
 B2 G E2 C | F3- FC C | FFF CCC | FFF AGF | GGG C2 E | G2 F EDC | D2 D B,2 D | CCB, A,G,F, | 
 C2 C(CD) E | F2 G A2 c | B2 G E2 C | F3- F ||  