Your Galaxy Note8 features a microSD memory card slot. If your personal computer has a slot for that type of card (Most laptop computers are so-equipped), you should be able to save music files
The Samsung Galaxy Note8 is an Android phone and there are plenty of free ringtone apps such as MP3 Cutter, Myxer and more.
Here is a sample of the free ringtones (Samsung Galaxy Note8-compatible) offered here at MartinsRingtones.com:
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