Construct harmonious chords that enhance the provided tune.
{efg} a2 AcBA | E2 A2 AcBA | F2 B2 BcBA | GABc defg | a2 A2 AcBA | E2 A2 AcBA | 
 GABc defg | a4 a4 :| A2 a2 A2 a2 | A2 AB cB A2 | E2 e2 E2 e2 | 
 E2 Bc dc B2 | A2 a2 A2 a2 | A2 AB cB A2 | E2 B2 BcdB | A4 a4 :| 
 c/e/e/e/ c/e/e/e/ d/f/f/f/ d/f/f/f/ | c/e/e/e/ c/e/e/e/ dB Be | 
 c/e/e/e/ c/e/e/e/ d/f/f/f/ d/f/f/f/ | e/a/g/f/ e/d/c/B/ Aa A2 |]  
X:1
L:1/8
M:4/4
K:A
"A"{efg} a2 AcBA |"A" E2 A2 AcBA |"Bm" F2 B2 BcBA |"E7" GABc defg |"A" a2 A2 AcBA |"A" E2 A2 AcBA | 
"Bm" GABc"E7" defg |"A" a4 a4 :|"A" A2 a2 A2 a2 |"A" A2 AB cB A2 |"E7" E2 e2 E2 e2 | 
"E7" E2 Bc dc B2 |"A" A2 a2 A2 a2 |"A" A2 AB cB A2 |"E7" E2 B2 BcdB | A4 a4 :| 
"A" c/e/e/e/ c/e/e/e/"D" d/f/f/f/ d/f/f/f/ |"A" c/e/e/e/ c/e/e/e/"E7" dB Be | 
"A" c/e/e/e/ c/e/e/e/"D" d/f/f/f/ d/f/f/f/ |"A" e/a/g/f/"E7" e/d/c/B/"A" Aa A2 |]  