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=75
M:2/4
K:G
['GG/B/ GG/B/', 'B2 DF/A/ cB/A/']  
X:1
L:1/8
Q:1/4=75
M:2/4
K:G
 D | GG/B/ GG/B/ | GG/B/ dd | eA/B/ cc | d/c/B/d/ gg | GG/B/ GG/B/ | GG/B/ dd | eA/B/ cB/A/ |1 
 GGG :|2 GG G2 |: eG c2 | dG B2 | DF/A/ cB/A/ | GB/d/ g2 | eG c2 | dG B2 | DF/A/ cB/A/ |1 GG G2 :|  