Develop a musical composition based on the provided pattern of letters and incorporating the given motif within it.
X:1
L:1/8
M:3/4
K:A
['ef/g/ aagg ff Te4 cB/c/ ddcc', 'A4 AB/c/ BB B2 Bc/d/ cc c2']  
X:1
L:1/8
M:3/4
K:A
 ef/g/ aagg | ff Te4 | cB/c/ ddcc | BB A4 :: AB/c/ BB B2 | Bc/d/ cc c2 | cd/e/ dd d2 | 
 de/f/ ee e2 | ef/g/ aagg | ff Te4 | cB/c/ ddcc | BB A4 :|  