Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/8
Q:1/4=80
M:6/8
K:D
['B A', 'f3/2 e/ d d']  
X:1
L:1/8
Q:1/4=80
M:6/8
K:D
 F3/2 E/ D D2 B | A F d A F D | F E E E F A | d3/2 c/ B BA F | A d f e d c | B A F A B d | 
 F3/2 E/ F d c B | A D F{F} E2 D || d2 A e2 A | f3/2 e/ d d A B | A F D D2 d | 
 f g/f/ e/d/{f} e2 d | d2 A ef g |{g} f3/2 e/ d d c B | A3/2 B/ A A D E | F3/2 G/ F{F} E2 D ||  