Develop a musical composition based on the provided pattern of letters and incorporating the given motif within it.
X:1
L:1/8
Q:1/8=128
M:4/4
K:D
['D<D F<A d>e f>e d/c/B/A/']  
X:1
L:1/8
Q:1/8=128
M:4/4
K:D
|: A, | D<D F<A d>e f>e | d/c/B/A/ G/F/E/D/ C/D/E/D/ C<A, | D<D F<A d>e f>e | 
 d/c/B/A/ B/g/f/e/ f<d dA, | D<D F<A d>e f>e | d/c/B/A/ G/F/E/D/ C/D/E/D/ C<A, | D<D F<A d>e f>e | 
 d/c/B/A/ B/g/f/e/ f<d df | a>b a<f d'>c' ba | g>f e>d c/d/e/d/ c<A | a>b a<f d'>c' ba | 
 d'/c'/b/a/ b<c' d'2 d (3(a/b/c'/) | d'>d c'>d b>d a>f | g>f e>d c/d/e/d/ c<A | F<D A>F G>F E>e | 
 d/c/B/A/ B<c d2 d :|  