Compose a piece of music following the specified structure and theme.
X:1
L:1/8
M:4/4
K:C
['BAG AGF', 'G2 d dgf gfg abg fed bag', 'dBG GFG'  
X:1
L:1/8
M:4/4
K:C
[M:6/8][K:G] .abc (G/A/) | BAG AGF | DGE FGA | BAG Bcd | cAG F2 (d/c/) | BAG AGF | GBd gag | 
 fed gdB | cAF G2 :| | d | dgf gfg | abg fed | bag afd | def g2 a | bag agf | gbg fed | def gdB | 
 cAF G2 :| | (B/c/) | dBG GFG | BGB dBG | cAF FEF | AFA cAF | dBG GFG | gbg fed | def gdB | 
 cAF G2 :|  