Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/8
M:4/4
K:Emin
['GB Ad', 'AG FE']  
X:1
L:1/8
M:4/4
K:Emin
 BE EBAG AF F2 | GF/E/ AF DB B2 | eB/A/ GB Ad z2 | B2 AG F2 z2 | eg fe d/e/f z2 | Be ed B/c/d z2 | 
 B4 GB Ad | eB AF E4 | E/G/B E/G/B B/A/G z2 | F/G/A E/F/G FE z2 | eB/A/ GB Ad z2 | B2 de e4 || 
 G/A/B AG FE z F | GF/E/ AF DB z2 | B4 AG FE | D2 EF F4 | gB Bg fe z2 | d/e/f Be ed z2 | 
 Be d/e/f dB z2 | B2 AG F4 | d4 BG AF | GE D/E/F EG AF | G/A/B Ad eB z2 | G2 FE E4 ||  