Create a musical composition based on the alphabetic representation of the predetermined pattern and the given melodic theme.
X:1
L:1/4
M:3/4
K:Bb
['G G', '(G/A/4)B/4 G2 ||[M:3/4] G D C[K:bass] ||[M:2/4]', 'C2 [M:3/4] D C B, ||[M:2/4]', '']  
X:1
L:1/4
M:3/4
K:Bb
 G G G ||[M:2/4] D/(D/8A/8) (G/A/4)B/4 | G2 ||[M:3/4] G D C[K:bass] ||[M:2/4] G,/>G,/ D | C2 || 
[M:3/4] D C B, ||[M:2/4] G,{/C} B, | G,2 |]  