Develop a musical composition based on the provided pattern of letters and incorporating the given motif within it.
X:1
L:1/8
Q:1/4=120
M:2/4
K:C
['CDEC D2 DE F2', 'G2 GF E2 DE F2', 'CDEC D2 DE F2']  
X:1
L:1/8
Q:1/4=120
M:2/4
K:C
 CDEC | D2 DE | F2 F2 | E2 E2 | CDEC | D2 DE | F2 G2 | C4 :| G2 GF | E2 DE | F2 G2 | F2 E2 | 
 G2 GF | E2 DE | F2 G2 | D4 || CDEC | D2 DE | F2 F2 | E2 E2 | CDEC | D2 DE | F2 G2 | C4 |]  