Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/8
M:2/4
K:D
['FAGB Af f/e/f Ge e/d/e', 'f/e/f ge e/d/e'  
X:1
L:1/8
M:2/4
K:D
|: FAGB | Af f/e/f | Ge e/d/e | Fd d/c/d | FAGB | Af f/e/f | Ge e/d/e |1 ddd z :|2 !fermata!ddda |: 
 d'b b/a/b | af f/e/f | ge e/d/e | fd d/c/d | d'b b/a/b | af f/e/f | ge e/d/e | dfd z :|  