I need to cancel Apple Music

Hi Gemdan81

welcome to the Apple (user-to-user) Community!

Re: "I have lost my phone"

Find your lost Apple device or AirTag with Find My - Apple Support

or

Use Lost Mode in Find Devices on iCloud.com - Apple Support

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Re: "I have lost my phone with old Apple ID and cannot cancel Apple Music"

You might want to check whether you have another old computer or device with that same old Apple ID:

or

What to do If you forgot your Apple ID email address or phone number:

See: If you forgot your Apple ID - Apple Support

and

What to do: If you forgot your Apple ID password - Apple Support

If all else fails:

See: How to use account recovery when you can’t reset your Apple ID password - Apple Support

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Re: "I need to cancel Apple Music" / "cannot cancel Apple Music"

You may be able to cancel your subscription on the web if you recovered your Apple ID and Apple ID password.

Apple support's article: How to cancel Apple Music - Apple Support

says:

1. Go to music.apple.com.
2. Choose Sign In at the top of the page. If you don't see Sign In, skip this step.
3. Tap or click the account icon .
4. Choose Settings.
5. Scroll to Subscriptions and choose Manage.
6. Choose Cancel Subscription.

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More info: (info / support / contact options (online chat / phone / email etc.)

Music Support Webpage : Music - Official Apple Support

Else:

There is a "Get support-start now" link (online chat / phone / email etc.) at the bottom of the website below:

Billing and Subscriptions Support website: Subscriptions and Billing - Official Apple Support

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If you find you still need help: You might want to contact Apple for support and service:

See a list of Apple phone numbers around the world: Contact Apple for support and service - Apple Support

All the best :-)