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:Amix
['(f/g/) (a>g)']  
X:1
L:1/8
M:2/4
K:Amix
 D | (d>c) (de) | (fg) (ed/c/) | (d>c) (.A.A) | A3 (f/g/) | (a>g) fa | (g>f e).A | 
 .d(e/f/) (g/e/)({e}d/c/) | d3 (f/g/) | (a>g) (f(b/>a/)) | (g>f) (ed/c/) | de/f/ (g/f/)(e/d/) | 
 (c<A) z c | d>c de | fd g(e/>d/) | dc A(3(G/A/B/) A3 ||  