Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/4
M:4/4
K:D
['B E3/2 F/', 'B A A']  
X:1
L:1/4
M:4/4
K:D
|: B ||"Em" E3/2 F/ G F | E D B2 |"D" B A A G/A/ |"B7" B A A B |"Em" E3/2 F/ G F | 
 E D"B7" B3/2 A/ |"Em" G E"D" F D |"Em" E3 F | |"G" G3/2 A/ B g/f/ | e d B2 |"D" B A A G/A/ | 
"B7" B A A B |"G" G3/2 A/ B g/f/ | e d"B7" B3/2 A/ |"Em" G E"D" F D |"Em" E3 :|  