Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
Q:1/4=90
M:4/4
K:Ab
['E EA c3 BA GF']  
X:1
L:1/8
Q:1/4=90
M:4/4
K:Ab
 E EA |"Ab" c3 c"Db" BA GF |"Ab" F2 E3 E GA |"Eb7" B3 B BB AB |"Ab" c4 z E EA | c3 c"Db" BA GF | 
"Ab" A2 E3 A3 |"Ab" AG FG"Db" F3 A |"Ab/Eb" A4"Eb7" G4 |"Ab" A4 z A GA |"Eb" B3 B"Bb7" BB c>B | 
"Eb7" B2 e3 e ed |"Ab" c3 B"Fm" AA"Bb7" GA |"Eb" B4 z B"Eb7" cd |"Ab" c3 B AA B>A |"Db" A2 d4 F2 | 
 GA EE"Ab/Eb" E3 A | A4"Eb7" G4 |"Ab" A4 z |]  