Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
M:4/4
K:G
['(B>c) (d<B)(c<A) G2 d2 (e<g)(f<a) Tg3 (f/e/)', 'z2 (de) (fd)(fg){fg} a3 g (Tfe)(Tdc){c} B3', 'z2 B>c d(c/B/){d} c(B/A/) (GB) d2 eEfF', 'z2 (d>e) .f(A/d/) .f(d/f/) a3 g (3(fdf)']  
X:1
L:1/8
M:4/4
K:G
"_Slow" (B>c) | (d<B)(c<A) G2 d2 | (e<g)(f<a) Tg3 (f/e/) | (d<B) (TA>G) E2 (A/B/)c | 
 TB2{AB} A2 z2 A2 | (BA)(Bc) d3 e | Tfefg{fg} a3 g | (f<a)(f<d) B2 ^c2 | (Td>^c) d2 z2 :: (de) | 
 (fd)(fg){fg} a3 g | (Tfe)(Tdc){c} B3 c | (dG)(gf) (Ted)(TcB) | (TAG) A2 z2 (Bc) | 
 (d<B)(c<A) G2 d2 | (e<g)(f<a) Tg3 (f/e/) | (d<B) (TA>G) E2 F2 | (TG>F) G2 z2 :: B>c | 
{e} d(c/B/){d} c(B/A/) (GB) d2 | eEfF gG (g/b/a/g/) | (f/e/d/c/) (B/A/G/F/) Gg{f} e(d/c/) | 
 (TB3/2A/4B/4) A2 z2 A2 | .B(B/d/) .^c(c/e/) dDeE | (3(fag) (3(fed){fg} a3 g | 
 (fd)Bb a(g/f/){a} g(f/e/) | (Td>^c) d2 z2 :: (d>e) | .f(A/d/) .f(d/f/) a3 g | 
 (3(fdf) (3(afc){c} B3 c | .d/(B/TA/G/) .e/(c/TB/A/) .b/(g/Tf/e/){e} d(c/B/) | (TA>G) A2 z2 (B>c) | 
 (3(dBG) (3(cAF) G2 (3(dBg) | (3(ec'b) (3(agf) Tg3 (f/e/) | (d<B) TA>G Ee (d/c/B/A/) | 
 (TG>F) G2 z2 :|  