Build a series of chord progressions that fit well with the existing melody.
|: B2 f2 f2 ef | g2 e2 edcd | eAce efed |1,3 c2 c2 dcBA :|2,4 c2 B2 BAFA :: 
 B3 A Bcdc | B2 B2 c3 d | eAce efed | c2 c2"^(F#m)" dcBA | B3 A Bcdc | 
 B2 B2 c3 d |1,3 eAce efed ||2,4 c2 B2 B2 A2 :|O |] c2 B2 B4 |: 
"^The Wren lower octave:" B,2 F2 F2 EF | G2 E2 EDCD | EA,CE EFED |1,3 C2 C2 DCB,A, :|2,4 
 C2 B,2 B,A,B,A, :: B,3 A, B,CDC | B,2 B,2 C3 D | EA,CE EFED | C2 C2 DCB,A, | B,3 A, B,CDC | 
 B,2 B,2 C3 D |1,3 EA,CE EFED :|2,4 C2 B,2 B,2 A,2 :|O |] C2 B,2 B,4 ||  
X:1
L:1/8
M:2/2
K:Bmin
|:"Bm" B2 f2 f2 ef |"Em" g2 e2 edcd |"A" eAce efed |1,3 c2 c2 dcBA :|2,4 c2 B2"Bm" BAFA :: 
"Bm" B3 A Bcdc | B2 B2"A" c3 d |"A" eAce efed | c2 c2"^(F#m)" dcBA |"G" B3 A Bcdc | 
 B2 B2"A" c3 d |1,3"A" eAce efed ||2,4 c2 B2"Bm" B2 A2 :|O |] c2 B2"Bm" B4 |: 
"^The Wren lower octave:" B,2 F2 F2 EF | G2 E2 EDCD | EA,CE EFED |1,3 C2 C2 DCB,A, :|2,4 
 C2 B,2 B,A,B,A, :: B,3 A, B,CDC | B,2 B,2 C3 D | EA,CE EFED | C2 C2 DCB,A, | B,3 A, B,CDC | 
 B,2 B,2 C3 D |1,3 EA,CE EFED :|2,4 C2 B,2 B,2 A,2 :|O |] C2 B,2"Bm" B,4 ||  