Craft a fitting chord progression to merge seamlessly with the given musical theme.
"^instr." |: :: d/e/f/e/ f e/d/ | c g g f | g f/g/ f e/d/ | c d d!fine! z :: :| 
"^vocal" |: B B B (B/A/) | G A A (G/F/) | F F B (B/A/) | G A A z :| 
 B B B (B/A/) | G A A (G/F/) | F F G (G/F/) | E D D z | F F F (E/D/) | 
 C G G F | G F F (E/D/) | C D"^D.C.al fine" D2 |]  
X:1
L:1/4
M:2/2
K:Dphr
"^instr." |: ::"Dm" d/e/f/e/ f e/d/ |"Gm" c g g f |"Cm" g f/g/ f e/d/ |"Dm" c d d!fine! z :: :| 
"^vocal" |:"Gm" B B B (B/A/) |"Dm" G A A (G/F/) |"Bb" F F B (B/A/) |"Dm" G A A z :| 
"Gm" B B B (B/A/) |"Dm" G A A (G/F/) |"F" F F G (G/F/) |"Bb" E D D z |"Bb" F F F (E/D/) | 
"Cm" C G G F |"Cm" G F F (E/D/) |"Dm" C D"^D.C.al fine" D2 |]  