Compose a piece of music using the specified letter-based musical form and incorporating the assigned motif.
X:1
L:1/8
M:2/4
K:Bb
['f2 z2']  
X:1
L:1/8
M:2/4
K:Bb
 c c2 d | cdgb | c3 d | f f2 g | b2 cd | b2 z2 | bc d2 | c4 | bcbg | f2 z2 | g g2 b | gf d2 | 
 f2 z2 | gcbg | f2 gd | f4 |]  