Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:4/4
K:F#min
['GF FE', 'B2 GF GE F3']  
X:1
L:1/8
M:4/4
K:F#min
|:"E" B2 B2 | GF FE | GF FE |"F#m" F3 z ::"E" BB BA/B/ | cB B2 | GF GE |"F#m" F3 z :|  