C :: Would Save Memory Using Strdup In Code

I wrote a text parser to print all the words of each line separate from each other. My question is mainly concerning memory usage, should I go ahead and directly assign the contents of a token, or should I use strdup()? Or will the strings be freed when the pointer to arrays of characters is freed? Here is my code so far

Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main( )
{
FILE * music_file = NULL;
char line[BUFSIZ];
char ** tokens = malloc(sizeof(char *));
}

[code]....

In case you were wondering about some of the variable names, I am going to use this to parse notes in a music file for my program I've been developing lately.