questions about some datasets

[xiaxin1998]

Hi Thanks for your sharing of these datasets and contribution to the community of session-based recommendation.
I have some questions about the origin dataset.
For 30music and clef datasets, is there any description about them. Which platform are they from or are they used in session-based recommendation papers? I only see some papers use Tmall, Yoochoose, Diginetica, Retailrocket but I never see there is any paper using clef and 30music.

Thanks again!