Delete a Yandex.Music account
If you have a Yandex account that you use to log in to other services, then you will lose data saved on all the personal services connected to that account (Mail, Disk, etc.) if you delete it. For more information, read the Delete account section of the Yandex.Passport Help.
Don't delete your account just to cancel a recurring subscription or stop receiving notifications. You can disable Yandex.Music notifications in the settings of the web version and cancel your subscription at any time. If you purchased your subscription through iTunes, you can cancel it yourself even if you already deleted your account. If you deleted your account and forgot to cancel a subscription that you placed using the web version of the service, contact customer support.