Construct harmonious chords that enhance the provided tune.
dB | AFDF A2 dB | AFAd fedc | BGBd gfed | cdcB A2 dB | AFDF A2 dB | 
 AFAd fedc | BGBd gfed | ceAc d2 :: de | fdcd BdAF | DFAd f2 ef | 
 eAfA gagf | edcB A2 de | fdcd BdAF | DFAd f2 ef | eAfA gfed | 
 cABc d2 :|  
X:1
L:1/8
M:4/4
K:D
 dB |"D" AFDF A2 dB |"D" AFAd fedc |"G" BGBd"Em" gfed |"A7" cdcB A2 dB |"D" AFDF"F#m/C#" A2 dB | 
"D" AFAd fedc |"G" BGBd"Em" gfed |"A7" ceAc"D" d2 :: de |"D" fdcd BdAF |"D" DFAd f2 ef | 
"Em" eAfA gagf |"A7" edcB A2 de |"D" fdcd BdAF |"D" DFAd f2 ef |"G" eAfA"Em" gfed | 
"A7" cABc"D" d2 :|  