how to send data in postman post request code example

Example 1: send post request postman

{
 "title" : "test title",
 "singer" : "some singer"
}

Example 2: how to pass data between requests in postman

To pass data between requests in postman

I would use Enviroment or Global Variable
Lets say I want to pass my token between
requests. Than I would create empty global
variable and save the entire token response
as json and print the accessToken from 
response and set the value of global variable
to json field by writing like for example:

var responseJson = pm.response.json(); 
console.log( responseJson.accessToken  );
pm.globals.set("my_secret_token",  responseJson.accessToken );