Construct a melodic piece using the designated alphabetic pattern and the provided musical theme.
X:1
L:1/16
M:2/4
K:D
['f2fg fedB']  
X:1
L:1/16
M:2/4
K:D
 Ad |"D" f2fg fedB |"D" AAFA DFAc |"G" BBGB DGBG |"A7" AAFA DFAd |"D" f2fg fedB |"D" A2FA AFA=c | 
"G" BGBd"A7" cAce |"D" d2[df][df] [df]2 :: aa |"D" fdfa"^F#7;D7" fdff |"G" agga g2g/a/f | 
"A7" eece Aece |"D" beaa a2 (3gag |"D" ffdf"^F#7;D7" Aedf |"G" aafa g2 (3fag |"A7" eece Aceg | 
"D" fgec d2 :|  