Craft a fitting chord progression to merge seamlessly with the given musical theme.
!fermata!E2 |] AG Ac ec Ac | d2 df ec Ac | d2 fd c2 ec | B2 BA Bd cB | 
 AG Ac ec Ac | d2 df ec A2 | ag af ed cB | c2 A2 A2 :: e2 |] ae ce fe ce | 
 ae ce fe dc | d2 bd c2 ac | B2 BA Bd cB | AG Ac ec Ac | d2 df ec A2 | 
 ag af ed cB | c2 |1 A2 A2 c2 :|2 A2 A4 |:[K:D] e2 e2 E3 F | G FG AB AB c | 
 d2 d2 D3 E | F Ad BA FE D | e2 e2 E3 F | G FG AB AB c | d cB AB AG F |1 E8 E4 :|2 
 e4 |: B2 e2 e3 d | B de fg fe d | A2 d2 d3 c | A cd Bf ed f | e2 B2 g2 B2 | 
 a2 B2 b3 a | g fe dB AB d | e8 :|  
X:1
L:1/8
Q:1/4=200
M:4/4
K:A
 !fermata!E2 |]"A" AG Ac ec Ac |"D" d2 df"A" ec Ac |"D" d2 fd"A" c2 ec |"B7" B2 BA"E7" Bd cB | 
"A" AG Ac ec Ac |"D" d2 df"A" ec A2 |"B" ag af"E" ed cB |"A" c2 A2 A2 :: e2 |]"A" ae ce fe ce | 
 ae ce fe dc |"E7" d2 bd"A" c2 ac |"E" B2 BA Bd cB |"A" AG Ac ec Ac |"D" d2 df"A" ec A2 | 
"B7" ag af"E" ed cB | c2 |1"A" A2 A2 c2 :|2"A" A2 A4 |:[K:D]"Em" e2 e2 E3 F | G FG AB AB c | 
"D" d2 d2 D3 E | F Ad BA FE D |"Em" e2 e2 E3 F | G FG AB AB c |"Bm" d cB AB AG F |1"Em" E8 E4 :|2 
"Em" e4 |:"Em" B2 e2 e3 d | B de fg fe d |"D" A2 d2 d3 c | A cd Bf ed f |"Em" e2 B2 g2 B2 | 
 a2 B2 b3 a |"Bm" g fe dB AB d |"Em" e8 :|  