Create music using the given musical theme and adhere to the outlined letter-based structure.
X:1
L:1/8
M:3/4
K:D
['bg/b/{ab} a2 e>e', 'b2 b2 a(3b/a/f/ a>g']  
X:1
L:1/8
M:3/4
K:D
{ba} b2 bg/b/{ab} a2 | e>e a>b{ab} a>g | g2 f/g/f/e/ d>c | B2 bg/b/{ab} a2 | e>e a>b a>g | 
 g>f f4 ::{fg} f2 d(3c/d/e/ f>g |{fg} f2 dg{a} b2 | b2 a(3b/a/f/ a>g | e2 dc{AB} A2 | 
{fg} f2 d(3c/d/e/ f>g |{fg} f2 dg{a} b2 | b2 a(3b/a/f/ a>g | e<c d4 :|  