There was a time when Sony dabbled in the karaoke genre of games with the SingStar brand taking off to incorporate all sorts of musical tastes. Players would sing off against one another to find who was the better vocalist, and it became a bit of a party game hit. However, after 15 years of providing musical entertainment, the decision has been made to switch off the SingStar servers with January 31st 2020 being the cut off date.
After 15 incredible years, we have made the difficult decision to shut down the SingStore servers on 31 January 2020. After that date, you will still be able to enjoy your downloaded songs, but all online functionality and network features will no longer be available, and you will not be able to purchase any new songs from the SingStore. Any SingStar content you have shared to SingStar.com will be deleted. For PS3 users, please check that any digital purchases you have made and would like to keep have been downloaded onto your console before 31 January 2020. If you are a PS3 user and delete any content after that date, you won’t be able to redownload it.
Of course, any SingStar discs you have previously purchased will continue to work in offline mode, though you will not be able to obtain all trophies.
So, as the statement says, PS3 players need to download purchased content before January 31st or lose that content forever as it won’t be downloadable after that date. You can still play offline modes with any discs you have but they will only have the base content and nothing more. All online functionality will be removed including shared content through SingStar’s official website. The last SingStar game that was released was SingStar Celebration.
Source: SingStar Official Site