Formulate a range of chord couplings that heighten the harmonic components of the submitted musical creation.
|: a2 ag f2 d2 | a2 ag f4 | a2 ag fdag |1 fdec defg :|2 
 fdec d2 c2 |: d2 ef gfec | dBc^A Bcde | f2 ef gfec | 
 dBc^A B4 :|  
X:1
L:1/8
M:4/4
K:D
|:"A7" a2 ag"D" f2 d2 |"A7" a2 ag"D" f4 |"A7" a2 ag"D" fdag |1"D" fd"A"ec"D" defg :|2 
"D" fd"A"ec"D" d2"F#7" c2 |:"Bm" d2 ef"Em" gfec |"Bm" dB"F#7"c^A"Bm" Bcde |"Bm" f2 ef"Em" gfec | 
"Bm" dB"F#7"c^A"Bm" B4 :|  