Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/4
M:4/4
K:E
['F B G']  
X:1
L:1/4
M:4/4
K:E
 E G | F B G F/E/ | F B G c | B B B ^A | B2 E G | F B G F/E/ | F B G c | B B B ^A | B2 B e/B/ | 
 c B G/B/e/B/ | c B G/B/e/d/ | d/c/c/B/B/A/G/A/4B/4 | F2 B E | F E B/G/F/E/ | F/D/ E B E/F/ | 
 D/A/G/F/ G F/E/ | E2 |]  