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:G
['GB GB', 'dc Bc df']  
X:1
L:1/8
M:2/4
K:G
 vGB GB | GB dB | FA FA | FA cA | GB GB | GB d2 | (ec) AF | G2 z2 :: vge dc | Bc df | ge df | 
 (af) g2 | ge dc | Bc df | (ec) AF | G2 z2 :|  