Build a series of chord progressions that fit well with the existing melody.
f2f2 defd | cdcB A2F2 | f2f2 d2ef | gagf ecde | f2f2 defd | 
 cdcB A2F2 | defd efge | f2a2 f2 z2 |] a2a2 f2ga | gagf e2c2 | 
 a2a2 f2ga | bag^f gedc | a2a2 f2ga | gagf e2c2 | defd efge | 
 f2a2 f2 z2 |]  
X:1
L:1/16
M:2/4
K:F
"F" f2f2"Bb" defd |"C7" cdcB"F" A2F2 |"F" f2f2"Bb" d2ef |"G7" gagf"C7" ecde |"F" f2f2"Bb" defd | 
"C7" cdcB"F" A2F2 |"Bb" defd"C7" efge |"F" f2a2 f2 z2 |]"F" a2a2"Dm" f2ga |"Gm" gagf"C" e2c2 | 
"F" a2a2"Dm" f2ga |"Gm" bag^f"C" gedc |"F" a2a2"Dm" f2ga |"G7" gagf"C" e2c2 |"Bb" defd"C7" efge | 
"F" f2a2 f2 z2 |]  