Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/4
M:4/4
K:Bb
['B/c/ d3/2 B/ F f d g', 'F f', 'd/c/ d F F d F/d/ c/B/']  
X:1
L:1/4
M:4/4
K:Bb
"^A""^getragen" !fermata!B, !fermata!D | !fermata!F B/c/ | d3/2 B/ F | f d g | f3/2 e/ c | 
 F E/F/ d/c/ | B D | F B/c/ | d2 | !fermata!B, !fermata!D | !fermata!F B/c/ | d3/2 B/ F | f d g | 
 f3/2 e/ c | F E/F/ d/c/ | B3 ||[M:4/4]"^B""^frAPhlich, zA 1/4 gig" c E F | f e/d/ c | B D F | 
 f d/c/ B | A E F | f e/d/ c | B D | F d/c/ | B2 | c E F | f e/d/ c | B D F | f d/c/ B | A E F | 
 f e/d/ c | B3 ||[M:3/4]"^C""^schnell, lA 1/4 pfig" e G/G/ G/G/ | e G/e/ d/c/ | d F F | d F/d/ c/B/ | 
 c E F | f e/d/ c | B D F | d3 | e G/G/ G/G/ | e G/e/ d/c/ | d F F | d F/d/ c/B/ | c E F | 
 f e/d/ c | (B3 | B2) z |]  