Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
M:4/4
K:Emin
['B>E B>G E2 E/F/G A>B A<F D2', 'e/f/g b>g e<B g>e']  
X:1
L:1/8
M:4/4
K:Emin
 B>E B>G E2 E/F/G | A>B A<F D2 D/E/F | G>E F>A B<e e>f |1 g>e f/e/d e2 e>d :|2 g>e f>d e2 e>B || 
 e/f/g b>g e<B g>e | f/g/a d>a f<d a>f | e/f/g b>g e<B g>e | d>B A<F E2 E>B | e/f/g b>g e<B g>e | 
 f/g/a d>a f<d a>f | e>f g>f e>d B>G | A/B/c G>F E2 E2 ||  