Develop a musical composition based on the provided pattern of letters and incorporating the given motif within it.
X:1
L:1/4
Q:1/2=100
M:4/4
K:G
['B/c/ d B G E c A', 'D2 g/a/ b G F a g']  
X:1
L:1/4
Q:1/2=100
M:4/4
K:G
 B/c/ | d B G E | c A F D | f d ^c/d/e/^c/ | d D2 || g/a/ | b G F a | g E D e/f/ | g E2 g | 
 f D2 C/B,/ | C e B, d | A, c G, B | A G F/G/A/F/ | G G,2 |]  