OurSong uses the blockchain technology for all creations uploaded, hence the creations you own could rest in your Collection on the blockchain until the end of time if you don't trade or sell it.
However, the visual representation of the creation, along with all Exclusives and content uploaded by the Creators are attached to the OurSong's service. This means that if OurSong goes out of business, you may lose access to all that instead of the ownership of the creation on the blockchain.