Generate music by following the outlined musical form presented using letters and incorporating the provided motif.
X:1
L:1/4
M:4/4
K:D
['G E C']  
X:1
L:1/4
M:4/4
K:D
 D | D3/2 E/ F F | (G E) C E | G3/2 E/ C C | D3 A | A F F A | (A G) E F/ F/ | G E C A, | G3 F | 
 G G G A | F D D D | G E C A, | G3 F | G G B G | F G A F/ F/ | G E C E | D3 ||  