Construct a melodically pleasant tune that corresponds with the specified chord structure.
'D', 'D', 'Em', 'A', 'D', 'D', 'D', 'G', 'A7', 'D', 'A7', 'D', 'A7', 'A7', 'D', 'D', 'A7', 'D', 'G', 'A7', 'D'  
X:1
L:1/8
Q:1/2=112
M:2/2
K:D
|:"^A" z A |"D" d2 fd A2 fe |"D" defg afdf |"Em" e2 ge B2 ed |"A" cdef gece ||"D" d2 fd A2 fe | 
"D" defg afdf |"D" fafd fafd |"G" Bg"A7"ec"D" d2 ::"^B" cd |"A7" eAfA gAaA |"D" faaf gfed | 
"A7" AaBa cada |"A7" efed cBAc ||"D" dAeA fAgA |"D" faaf"A7" gfeg |"D" fafd fafd | 
"G" Bg"A7"ec"D" d2 :|  