Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
M:2/4
K:A
['A>Bcc d>B', 'fa ea d/c/B/A/', "F e a>bc'c' d'b c'2 c'b ba/b/", 'f a/g/ faef d/c/B/A/ c2 cB BA/B/']  
X:1
L:1/8
M:2/4
K:A
 E | A>Bcc | d>B c2 | cBBA/B/ | cBBA/F/ | A>Bcc | d>B c>B | AF FE/F/ | AFF :: e | fa ea | 
 d/c/B/A/ c2 | cB BA/B/ | cB Be | fa ea | d/c/B/A/ cB | AF FE/F/ | AF F :: e | a>bc'c' | d'b c'2 | 
 c'b ba/b/ | c'b ba/f/ | f>gaa | d'>b c'>b | a>f fe/f/ | af f :: a/g/ | faef | d/c/B/A/ c2 | 
 cB BA/B/ | cB Be | f{g}a ea | d/c/B/A/ c>B | AF FE/F | AF F :|  