Can someone please help me I don't know how to fix this errors include definition is

[kim21249]

Hi,
so, I am making a program which will flash different lights every time a different note is played (trying to play happy birthday). I keep getting the same errors and I have no idea how to fix them. Please help me.
This is my code:

int piezo = 8;
int ledrood = 2;
int ledgeel = 4;
int ledgroen = 7;
int ledblauw = 12;
int ledwit = 13;
int tweekeerlied = 50;
char namen[] = {'A','B','C','D','E','F','G'};
int tonen[] = {440, 493, 262, 294, 330, 349, 392};
char noten[] = {"GGAGCBGGAGDCGGGECBAFFECDC"};
int ritme[] = {3,2,2,2,2,4,3,2,2,2,2,3,2,2,2,2,2,2,3,2,2,2,2,4}; 

int tempo = 100;


void setup() {
  pinMode(piezo,OUTPUT);
  pinMode(ledwit, OUTPUT);
  pinMode(ledblauw, OUTPUT);
  pinMode(ledgroen, OUTPUT);
  pinMode(ledgeel, OUTPUT);
  pinMode(ledrood, OUTPUT);
}

void loop() {
  int i, lengte;
  for (i=0; i < tweekeerlied; i++)
  {lengte = ritme[i] * tempo;
   {if (noten[i] = ' ')
  {delay = lengte;}
   else {
     tone(piezo, tonen(noten[i]), lengte);
       if((tonen(noten[i]) = 392) || (tonen(noten[i]) = 440))
       {digitalWrite(ledrood, HIGH);
        delay(lengte);}
     else if ((tonen(noten[i]) = 349) || (tonen(noten[i]) = 493))
              {digitalWrite(ledgeel, HIGH);
               delay(lengte);}
              else if (tonen(noten[i]) = 330)
              {digitalWrite(ledgroen, HIGH);
               delay(lengte);}
              else if ((tonen(noten[i]) = 294) || (tonen(noten[i]) = 440) || (tonen(noten[i]) = 493))
              {digitalWrite(ledblauw, HIGH);
               delay(lengte);}
     else if (tonen(noten[i]) = 262)
              {digitalWrite(ledwit, HIGH);
               delay(lengte);};
     }
   }
              digitalWrite(ledrood, LOW);
              digitalWrite(ledgeel, LOW);
              digitalWrite(ledgroen, LOW);
              digitalWrite(ledblauw, LOW);
              digitalWrite(ledwit, LOW);
              delay(tempo/2);
  }
  while(true)
              {noTone(piezo);
               digitalWrite(ledrood, LOW);
               digitalWrite(ledgeel, LOW);
               digitalWrite(ledgroen, LOW);
               digitalWrite(ledblauw, LOW);
               digitalWrite(ledwit, LOW);
}
              
{int ritme(char noten)
              {int i;
               int notenaantal = 7;
               for(i=0;i<notenaantal;i++)
               {if (namen[i] == noten)
               {return(ritme[i]);}
                else {return(0)}
               }
              }
}

And these are my errors:

In function 'void loop()':

29:12: error: assignment of function 'void delay(long unsigned int)'

   {delay = lengte;}

            ^~~~~~

29:12: error: cannot convert 'int' to 'void(long unsigned int)' in assignment

31:32: error: 'tonen' cannot be used as a function

      tone(piezo, tonen(noten[i]), lengte);

                                ^

32:26: error: 'tonen' cannot be used as a function

        if((tonen(noten[i]) = 392) || (tonen(noten[i]) = 440))

                          ^

32:53: error: 'tonen' cannot be used as a function

        if((tonen(noten[i]) = 392) || (tonen(noten[i]) = 440))

                                                     ^

35:30: error: 'tonen' cannot be used as a function

      else if ((tonen(noten[i]) = 349) || (tonen(noten[i]) = 493))

                              ^

35:57: error: 'tonen' cannot be used as a function

      else if ((tonen(noten[i]) = 349) || (tonen(noten[i]) = 493))

                                                         ^

38:38: error: 'tonen' cannot be used as a function

               else if (tonen(noten[i]) = 330)

                                      ^

41:39: error: 'tonen' cannot be used as a function

               else if ((tonen(noten[i]) = 294) || (tonen(noten[i]) = 440) || (tonen(noten[i]) = 493))

                                       ^
41:66: error: 'tonen' cannot be used as a function

               else if ((tonen(noten[i]) = 294) || (tonen(noten[i]) = 440) || (tonen(noten[i]) = 493))

                                                                  ^
41:93: error: 'tonen' cannot be used as a function

               else if ((tonen(noten[i]) = 294) || (tonen(noten[i]) = 440) || (tonen(noten[i]) = 493))

                                                                                             ^

44:29: error: 'tonen' cannot be used as a function

      else if (tonen(noten[i]) = 262)

                             ^
66:15: error: a function-definition is not allowed here before '{' token

               {int i;

               ^

74:1: error: expected '}' at end of input

 }

 ^

exit status 1
assignment of function 'void delay(long unsigned int)'

Please help me. I would really appreciate it

[dev7060]

29:12: error: assignment of function 'void delay(long unsigned int)'

Assigning something to a function?

29:12: error: cannot convert 'int' to 'void(long unsigned int)' in assignment

Comparison operator needs to be used instead of the assignment operator.

error: 'tonen' cannot be used as a function

"tonen" is an array.

66:15: error: a function-definition is not allowed here before '{' token

74:1: error: expected '}' at end of input

Watch out for the curly braces.