Develop a musical composition based on the provided pattern of letters and incorporating the given motif within it.
X:1
L:1/8
M:2/4
K:B
['G3 D D2 C2 ||[M:3/4] F/<D/G/D/', 'C2 B,2 G,4 ||[M:2/4] B,<G, B,<G,', 'B,<G, C>B,']  
X:1
L:1/8
M:2/4
K:B
 G3 D | D2 C2 ||[M:3/4] F/<D/G/D/ D2 C2 | B,2 G,4 ||[M:2/4] B,<G, B,<G, | B,>G, G,2 | B,<G, C>B, | 
 B,<G, C>B, ||[M:3/4] B,<G, G,4 | G,6 |]  