Create a tune following the given language-based musical structure.
'Sectional: Through Composed'  
X:1
L:1/8
M:2/2
K:D
 b2 af d2 fd | Adfd eddd | b2 af d2 fd |1 ceec d4 :|2 cgec d4 ||"^*" Addd{c} BddB | Adfa gfed | 
 Addd{c} BcdB |1 Agec d2 af :|2"^**" Agec d4 ||"^Substitutions""^*" Addd{c} BcdB ||"^**" AgBc d4 ||  