Compose a piece of music using the specified letter-based musical form and incorporating the assigned motif.
X:1
L:1/4
M:3/4
K:D
['A G']  
X:1
L:1/4
M:3/4
K:D
 A, | D D D | D E =F | G E E | E2 A, | D2 D | =F E D/D/ | A2 A | A2 A | G2 G | =F F E/D/ | A3 | 
 A,2 A | A G A | A G A | =c _B A | G A G | =F2 F/F/ | =F F F | =F E D | A3 | D2 |]  