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:C
['Ba Ba', 'ag ag fe B2']  
X:1
L:1/8
M:2/4
K:C
"^A""C" g(g/^f/) ge | .c2 !>!c'2 |"Dm" a(a/^g/) af | .d2 !>!a2 |"G7" Ba Ba | Ba (a/^g/)a | 
"C" cg cg | cg (g/^f/)g | g(g/^f/) ge | .c2 !>!c'2 |"Dm" a(a/^g/) a.f | .d2 !>!a2 |"G7" Ba Ba | 
"C" cg (g/^f/)g |"G7" gg/a/ g/f/e/d/ |"C" ce c z ||[K:G]"^B""D7" df ed | c'3/2{/b}c' c'2 | df ed | 
"G" b>b !>!b2 |"D7" (f/e/)c (f/e/)c | fe c2 |"G" (e/d/)B (e/d/)B | ed B2 |"D7" df ed | 
 c'3/2{/b}c' c'2 | df ed |"G" b>b !>!b2 |"Am" (b/a/)a ea |"G" (a/g/)g dg |"D7" (g/f/)f b>a | 
"G" gg g"_>Teiil A" z ||[K:F]"^C""F" cf ac' |"C7" .b/(a/g/a/) !>!b2 | ce gb | 
"F" .a/(g/f/g/) !>!a2 | ag ag |"C7" fe B2 | Bc ed |"F" cb a2 | cf ac' |"C7" .b/(a/g/a/) b2 | 
 ce gb |"F" .a/(g/f/g/) a2 | ag ag |"C7" fe B2 | cb b>e |"F" ff f z |]  