Why does not the VK audio api list anything?

Because VK's api audio does not show me the list of cansines.

Show a list of songs with the audio api of VK, but only give me one with a link that says audio api unavailable.

This is what it prints me:

{"response":
[1,{
"aid": 1,
"owner_id": 100,
"artist": "Аудио доступно на vk.com",
"title": "и в официальных приложениях ВКонтакте",
"duration":25,"url":"https:\/\/vk.com\/mp3\/audio_api_unavailable.mp3"
}
]
}

Here's the example of what I'm implementing VK API