Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
M:2/4
K:F
['Tc2 f>d |{d} cB/A/', 'dg (eg) ce Tf2{ef} Fc/B/ TA>B cc', 'a>g fd |{d}', 'Bd (ca) Ac df Bb |{b} ag/f/']  
X:1
L:1/8
M:2/4
K:F
 A/B/"A" | Tc2 f>d |{d} cB/A/ cd/e/ |{e} f>d cA |{A} G2- GA/B/ | Tc2 f>d |{d} cB/A/ ca/g/ | 
 Tfd TcA |{A} [FC]2- [FC] :| c/B/"B" | TA>B cc | dB Bd |{d} c{B}A fA |{A} G2- Gc/B/ | TA>B cc | 
 dB dg | (eg) ce | Tf2{ef} Fc/B/ | TA>B cc | dB Bd | ca/g/ fA |{A} G2- Gc/B/ | Ac f_e dB gB | 
 (b/a/)g/f/ (c/f/)(e/g/) | Tf2{ef} F |: c/B/"C" | TA[FA,] [FA,][FA,] | T[FA,]>[GC] [AF]>[BG] | 
 cc{d} cB/A/ | (AG) Gc/B/ | AF FA | (Bd) (GB) | (Ac) (EG) | T[FC]2 [FC] :| c"D" | f2{a} gf/g/ | 
{fg} a>g fd |{d} cB/A/ fa |{a} g2 Tga | Tf>a{a} gf/g/ |{fg} a>g fd |{d} cB/A/{A} fA | [FC]2 [FC]c | 
 f2{a} gf/g/ |{fg} a>g fc | Bg Af | TG>A Bd | (ca) Ac | df Bb |{b} ag/f/ c/f/e/g/ | Tf2{ef} F |]  