Create musical pieces following the given structure and incorporating the suggested musical concept.
X:1
L:1/8
M:2/4
K:Bb
['F/F/F F/F/F d/d/d cB c/c/c BA', 'G/F/E/F/ ff dF dF cF cF'  
X:1
L:1/8
M:2/4
K:Bb
"Bb" F/F/F F/F/F | d/d/d cB |"F7" c/c/c BA |"Bb" Bg f2 | F/F/F F/F/F | d/d/d cB |"F7" c/c/c BA | 
"Bb" B3 z |:[K:F]"F" cA/F/ cA/F/ | f>c c>E | F/G/A/B/ cf |"C7" c2 c2 |"F" cA/F/ cA/F/ | f>c c>E | 
"F" F/G/A/B/"C7" c>E |"F" F3"_>Teil A" z ::[K:Eb]"Eb" Bg e>G |"Fm/Ab" Fd c>B |"Bb7" dc BA | 
"Eb" Gc BB/B/ | Bg e>G |"Fm/Ab" Fd c>B |"Bb7" d/c/B/A/ G>d |"Eb" e2"_Fine" z2 :: 
[K:Bb]"F7" G/F/E/F/ ff |"Bb" dF dF |"F7" cF cF |"Bb" d>B f2 |"F7" G/F/E/F/ ff |"Bb" dF dF | 
"F7" cF cF |"Bb" B2"_>Teil C" B2 :|  