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=100
M:6/8
K:G
['G B']  
X:1
L:1/8
Q:1/4=100
M:6/8
K:G
 D | G D G B G B | d3 c2 (G/A/) | B c B A G A | G3 z2 D | G D G B G B | d3 c2 (G/A/) | 
 B c B A G A | G3 z2 B | d B d d B d | e3 d (BA) | G B d d c B | (B3 A2) (B/A/) | G D G B G B | 
 d3 c2 (G/A/) | B c B A G A | G3 z2 |]  