If you actually read the Krykey legal terms, you'd see that you can't use any copyrighted material and that you are legally liable. Below is copied and pasted from Krykey's legal section.
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Copyright Policies
Content: You, as well as other Users, may upload, share and publish your Content, including, but not only, audiovisual materials, audio recordings, texts and interpretation of texts, and other creative content (Hereinafter: Content) via Platform. In order to do so, You warrant that any content shared or Used by you on Platform or Application is owned by You in whole and that you have the full copyright for Content, including permission to allow redistribution of that content, including any derivative works for any means.
We recommend to use CC-licensed music, CC offers free copyright licenses that anyone can use (without a lawyer) to mark their creative work with the freedoms they want it to carry. Several sites offer music published under Creative Commons flexible copyright licenses. for more info, you can visit
http://creativecommons.org/legalmusicforvideos. Please check out the terms of each song license before you use/stream it.
License: You hereby grant KryKey and Users of Platform a royalty-free, non-exclusive right to listen but not record, save, reperform or download , use, reperform or download Content or any part thereof shared by you on Platform. You hereby state that you obtained all relevant rights and copyrights to content shared by you and that you permit any use of content via Platform for its operation and use.
Copyright Infringement: Any use of Content not according to this clause 4 to these Terms shall be constructed as Copyright Infringement and you undertake to compensate KryKey for its damages and for any other revenue generated to You, or any other 3rd Party, from such Copyright Infringement.
No Liability: You understand that all Content provided by you, whether publicly posted or privately transmitted, are at your sole responsibility. KryKey does not control the Content posted via the Platform and, as such, does not guarantee the accuracy, integrity, or quality of Content. You commit to not use the Platform to convey, post, publish, or otherwise transmit any Content that is violation with Clause 2.43 of these Terms. You are solely responsible for any posting of Content, and agree to indemnify KryKey for any damage arising from such activity violating any laws or terms of service.
Prescreen: You acknowledge that KryKey cannot pre-screen all Content, but that it shall have the right (but not the obligation) in their sole discretion to refuse or move any Content or User Account that is available via the Platform. KryKey shall have the right to remove any Content or Account that violates these Terms or is otherwise objectionable.