Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:4/4
K:Edor
['E2 D2 (EF) G2 A2', 'GA GF']  
X:1
L:1/8
M:4/4
K:Edor
"^Intro" |:"Em" E2 E2"D" D2 (EF) |"Em" G2 A2 (GA) (GF) | E2 E2"D" DD CD |"Em" E8 :: 
[K:Ephr]"E" EB Bc Bc BA |1"Dm" GA GF ED"E" E2 :|2"Dm" GA GF ED"E" E>E |"Am" EA AA BA"E" B2 | 
 EB Bd"Am" c/B/A"E" B2 ||  