Compose a tune that integrates the letter-based representation of the determined musical pattern and the given melodic idea.
X:1
L:1/8
M:6/8
K:D
['', 'DFA DFA', 'a2 f']  
X:1
L:1/8
M:6/8
K:D
 d/B/ |: AFA DFA | DFA DFA | AFA DFA | DFA Bcd | AFA DFA | DFA DFA | def gea | fdB Bcd :: 
 def a2 f | b2 g a2 f | afd edB | def a2 f | b2 g a2 f | b2 g a2 f | def gea | fdB Bcd :|  