Assemble a piece of music by merging the alphabetic representation of the predetermined musical pattern and the provided melodic theme.
X:1
L:1/8
M:4/4
K:D
['FG A>B AF', 'D2 DE']  
X:1
L:1/8
M:4/4
K:D
 FG |:"D" A>B AF A2 de | f>e fa d2 dc |"G" Bc dB"D" AF DF |"A" E2 E>F E2 FG |"D" A>B AF A2 de | 
 f>e fa d2 dc |"G" Bc dB"A" AF EF |1"D" D2 DE D2 FG :|2"D" D2 DE D2 de |:"D" f>e fg a2 dc | 
"G" B>A Bc d2 AA |"G" B>c dB"D" AF DF |"A" E2 E>F E2 FG |"D" A>B AF A2 de | fe fa d2 dc | 
"G" B>c dB"A" AF EF |1"D" D2 DE D2 de :|2"D" D2 DE D2 |]  