Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
M:2/2
K:G
['A>^c c2 A>c c2 A>d d>A f4', 'B>a Tg2', 'e2 e2']  
X:1
L:1/8
M:2/2
K:G
 de | ed Ac E2 F2 | .G(B,C).E D3 ^D | .E(^GA).c .F(ed).F | (GB)de d2 de | (ed)(Ac) E2 F2 | 
 GB,CE D2 ^D2 | E(^GA)c (Fe)dF | G2 G2 G2 AB | A>^c c2 A>c c2 | A>d d>A f4 | (fag).A (^dfe)A | 
 (egf).A (^ced).B | A>^c c2 A>c c2 | A>d d>A f4 | fa gA ^dfeA | dddd dd ||[K:C]"^Trio" G2 | 
 c>G TG2 e>G Tc2 | B>a Tg2 B>a Tg2 | (fa)(af) .f(GB).d | (eg)gc eG TAG | c>G TG2 e>G Tc2 | 
 B>a Tg2 B>a Tg2 | (fa)ad f.G.A.B | c2 c2 c2 || c>d | e2 e2 d>BA>c | e2 e2 c>BA>a | g>fd>a g>fd>a | 
 g>fd>f e>Bc>d | e2 e2 c>BA>c | e2 e2 c>BA>c | B>cd>e f>ga>b | [Ac']2 [Ac']2 [Ac']2 ||  