A problem to get the list of songs

I can not get a list of all songs of 'Section 27 Netlabel'.

Here is the info about the artist:

http://developer.echonest.com/api/v4/artist/profile?api_key=API_KEY&id=ARMDJXY130D2653DA8

This is his track:

http://developer.echonest.com/api/v4/track/profile?api_key=API_KEY&id=TRIGFPJ14A76056965

But there is no information about his songs:

http://developer.echonest.com/api/v4/artist/songs?api_key=API_KEY&id=ARMDJXY130D2653DA8&start=0&results=10

How can I get info about all tracks of this artist?