Compose a tune that integrates the letter-based representation of the determined musical pattern and the given melodic idea.
X:1
L:1/4
Q:3/4=80
M:6/4
K:Bb
['g g3/2 f/ e d3/2 c/ B', 'd e f g']  
X:1
L:1/4
Q:3/4=80
M:6/4
K:Bb
 g | g3/2 f/ e d3/2 c/ B | c3/2 d/ B A2 G | B .c d e c2 | d2 g ^f2 g | a3/2 g/ ^f =e2 d | d3- d2 :: 
 d | d e f g a b | c' a f b2 d | e f g c A F | B3 B c d | e3/2 d/ c d g ^f | g3 a3 | b a g a ^f d | 
 g3- g2 :|  