Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/8
M:4/4
K:D
['f2 f>e d2 d>B', 'A>df>d a>df>d'  
X:1
L:1/8
M:4/4
K:D
 f2 f>e d2 d>B | A>Bd>e f<BB>e | f2 f>e d2 d>B |1 A>da>g f<dd>e :|2 A>da>g f<dd>B || 
 A>df>d a>df>d | A>df>d e<B B2 | A>df>d a>df>d | f/g/a e>g f<dd>B | A>df>d a>df>d | A>df>d e<BB>e | 
 f2 f>e d2 d>B | A>da>g f<dd>e ||  