Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/4
Q:3/4=90
M:6/4
K:F
['B3/2 A/ B G', 'f c A']  
X:1
L:1/4
Q:3/4=90
M:6/4
K:F
 d | B3/2 A/ B G A B | c3/2 d/ e A B c | B3/2 A/ B G g f | e g2 d2 :| e | f c A f c A | 
 f c A f c A | g d B g d B | g d B g d B | f c A f c A | f c A f c A | g d g e c e | d g2 d3 |]  