Develop a musical composition based on the provided pattern of letters and incorporating the given motif within it.
X:1
L:1/4
Q:1/4=160
M:2/2
K:Gmin
['G G']  
X:1
L:1/4
Q:1/4=160
M:2/2
K:Gmin
"Gm" G G B B |"F" A G F F |"Bb" B c d B |"F" c c"Bb" B B |"Gm" G G B B |"F" A G F F | 
"Gm" B B"Cm" A G |"Dm" G F"Gm" G G |]  