Craft a musical piece that integrates the provided melodic theme and the corresponding alphabetical pattern.
X:1
L:1/8
M:4/4
K:Emin
['b4 b4 a2 f2']  
X:1
L:1/8
M:4/4
K:Emin
"B" ^decd efde | f8 |"Am" fgab agfe |"B" f8 |"B" fbba aggf |"Em" e2 f2"B" ^d4 |"Am" ^decd efdc | 
"B" B8 |"G" b4 b4 |"D" abag"B" a2 f2 |"Em" g6 fe |"B" f2 b2 f2 B2 |"G" b4 b4 |"D" abag"B" a2 f2 | 
"Em" efge"B" fgf^d |"Em" e8 |]  