Develop a musical composition based on the provided pattern of letters and incorporating the given motif within it.
X:1
L:1/4
M:4/4
K:G
['G B', 'F E']  
X:1
L:1/4
M:4/4
K:G
"^A" B B/A/ G B | c c/B/ A c | B B/A/ G B | A F E D | B B/A/ G B | c c/B/ A c | 
 B/d/ B/G/ A/c/ A/F/ | G B G2 ::"^B" D G/G/ D G/G/ | F E F E | D G/G/ D G/G/ | F G A2 | 
 D G/G/ D G/G/ | F E F E | D G B3/2 A/ | G F G2 :|  