Develop a musical composition using the alphabetic representation of the specified sequence and incorporating the given motif.
X:1
L:1/8
Q:1/4=120
M:4/4
K:C
['B2 z', 'c4 [ecG]2 [ec]ff z e2 f e']  
X:1
L:1/8
Q:1/4=120
M:4/4
K:C
 G | c2 c2 c/d/e/f/ g c | d2 d2 de/f/ e3 G | c/d/c/d/ e/f/e/f/ g2 d e B | cd/e/ dc B2 z G | 
 B G g ^f/e/ d/c/ B/A/ G2 A G3 | c2 c G A F | f e d c B2 z A2 | g2 f2 e/c/e/B/ g2 f | e2 d2 c4 |: 
 [ecG]2 [ec]ff z e2 | f e d c B2 z G g2 f e/d/e/f/ g f e2 d2 c4 :|  