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:2/4
K:D
['B2 Bc', 'df BA']  
X:1
L:1/8
M:2/4
K:D
 A2 AF/A/ | BA FE | DB BA | B2 Bc | da f/g/f/e/ | dB BA | FB BA |1 B2 BG :|2 B2 Bc |: d2 de/f/ | 
 ec Ac | dB BA | FB BA | d2 de/f/ | ec Ac | Bb ba | b2 ba | f2 fe | da fe | df BA | df BA | 
 dc/d/ ed/e/ | fb ba | fb ba | fe dB ||  