How to find mount point for audio CD/DVD

Audio CDs are a bit different - there's no actual filesystem there and as such they can't be mounted. Gnome's gvfs subsystem (which stands for "virtual filesystem") provides a file-like view of tracks on the audio CD, but it does it by directly accessing the device, without actually mounting it. So the tracks on the Audio CD look like files, but in fact they're not. They don't have real filenames, file size in bytes or other attributes of normal files.

You can convert those tracks to normal .mp3 or .ogg files using CD-ripping software if you need.

The "mount points" for gvfs (though they're not real mount points) are created in ~/.gvfs folder. There's supposedly also gvfs-mount command which can list/manage the mounts

Googling for "gvfs cdda" will provide you with additional information if you're still curious.