Form a musical piece based on the provided motif while observing the defined structure.
X:1
L:1/8
M:2/4
K:F
['c/d/c/B/ c/d/c/B/ ca f2', 'df a2', 'fd f2', 'z2 ABAG ^FD=EF GABc dd/e/ d2 db'  
X:1
L:1/8
M:2/4
K:F
 c/d/c/B/ c/d/c/B/ | ca f2 | d/e/d/c/ d/e/d/c/ | db g2 | c/d/c/B/ c/d/c/B/ | ca f2 | ec'be | f4 :: 
 df a2 | df a2 | g/f/e/d/ ^c/d/e/c/ | df A2 | df a2 | fa c'2 | b/a/g/f/ e/f/g/e/ | f4 :: 
[K:Bb] fbag | fd f2 | ec e2 | dB d2 | Bbag | fd f2 | edeA | B2 z2 :: ABAG | ^FD=EF | GABc | 
 dd/e/ d2 | db b/a/b | ca a/g/a | gffA | B3 z :|  