Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:4/4
K:Emin
['B A']  
X:1
L:1/8
M:4/4
K:Emin
 G2 F E E2 (GA) | B2 B A D2 E E | G2 F E B d ^c A | B6 B2 | !fermata!e3/2 f/ e d !fermata!B2 d B | 
 A B A G E2 A2 | B d ^c A B2 E E | (AG) D F E4 |]  