Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
Q:1/8=180
M:4/4
K:Emin
['BEED E2 (3DEF G2 AG FGAc BEDE', 'gfga bgeg']  
X:1
L:1/8
Q:1/8=180
M:4/4
K:Emin
 BEED E2 (3DEF | G2 AG FGAc | BEDE B2 ef | gfed g2 fg | BEED E2 (3DEF | G2 AG FGAc | BEDE B2 ef | 
 gfed e2 || ef | gfga bgeg | fefg afdf | gfga bgeg | fedf e3 f | gfga bgeg | fefg afdf | 
 g2 bg fgaf | gfed (3efg fg | e8 |]  