Hi, ManojIncapio.
We appreciate you taking the time to post in the Apple Support Communities. We see that you’re enjoying the Apple One free trial, but you’re concerned because you don’t have access to your Apple Music with the trial. Have you had an Apple Music subscription in the past? If you had one when you signed up for Apple One, did you cancel your Apple Music?
We’re asking because the Apple One free trial will only include services that you don’t already have, or haven't already tried. If you no longer have Apple Music, services that you have used previously will be automatically included in Apple One after your free trial period has expired and you're billed on January 24.
The paragraph in “What’s included with Apple One” explains:
Bundle Apple subscriptions with Apple One - Apple Support
Warmest Regards.