Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
M:6/8
K:D
['ded dAF', 'dfa afd', 'dAF dAF', 'dAF ABA', 'afd cde', 'dAF dAF']  
X:1
L:1/8
M:6/8
K:D
 ded dAF | ABA ABc | ded dAF | E2 e gfe | ded dAF | ABA a2 g | fef dBA | Bdc d2 A :: dfa afd | 
 cde ecA | dfa afd | faa a2 f | dfa afd | cde eag | fef dBA | Bdc d2 A :: dAF dAF | ABA ABc | 
 dAF dAF | E2 e gfe | dAF dAF | ABA a2 g | fef dBA | Bdc d2 A ::"^variations" ded dAF | ABA ABc | 
 dAF DFA | Bee efe | ded dAF | ABA Aag | f3 dBA | Bdc d2 A :: dfa afd | cde ecA | dfa afd | 
 a^ga b=ge | dfa afd | cde eag | f2 e dBA | Bdc d2 A :: dAF dAF | dAF ABc | dAF dAF | Eee e2 f | 
 dAF dAF | dAF a2 g | fef dBA | Bdc d2 A :|  