Craft a musical piece in accordance with the designated structure and theme.
X:1
L:1/8
M:4/4
K:D
['g fddA AFFD Eg', 'f/g/a/f/ dg f/g/a/f/ df'  
X:1
L:1/8
M:4/4
K:D
 g | fddA AFFD | Eg f/g/a/f/ e3 g | fddA AFFD | Eg f/g/a/f/ d3 :: g | f/g/a/f/ dg f/g/a/f/ df | 
 g/a/b/g/ eg g/a/b/g/ eg | f/g/a/f/ dg f/g/a/f/ df | eg a/g/f/e/ d3 :|  