Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
Q:1/4=100
M:6/8
K:D
['ADD BDD ADD', 'D2 g>ag f>gf e>fe c2 d e>dc']  
X:1
L:1/8
Q:1/4=100
M:6/8
K:D
 D>ED A2 A | d>ed c3 | B>cB A>BA | G>AG F2 G | ADD BDD | ADD BDD | ADD B>cd | E3 D D2 || 
 g>ag f>gf | e>fe c2 d | e>dc B>cd | B2 A A2 A | dAA eAA | fAA gAA | aAA gAA |"^Da Capo" f>gf e3 |]  