Develop a musical composition that aligns with the given structural outline and thematic content.
X:1
L:1/8
M:2/4
K:D
['FA GB Af fe/f/', 'gf e/g/f/e/ dB BA/B/ cA', 'G2 B/c/ dB B/d/c/B/ AF FE/F/ GE'  
X:1
L:1/8
M:2/4
K:D
"^A" FA GB | Af fe/f/ | Ge ed/e/ | Fd dc/d/ | FA GB | Af fe/f/ | ge e/g/f/e/ | df d2 || 
"^B" gf e/g/f/e/ | dB BA/B/ | cA AG/A/ | BG GA/G/ | gf e/g/f/e/ | dB BA/B/ | cA A/c/B/A/ | GB G2 |: 
"^Alt.B" B/c/ | dB B/d/c/B/ | AF FE/F/ | GE E/G/F/E/ | ED D :|  