Jay Z announced this week that he's putting on a special concert in New York City to promote Tidal, featuring rare B-sides and songs he's only performed rarely, if at all.

The show, set for May 13, is free, but to win tickets, Tidal users have to submit a playlist. The show will also stream live on Tidal's website, Billboard reports.

At the same time, the music industry website Hypebot reports that Tidal has raised their subscription rates by 30 percent. We're not sure when the price increase actually occurred, but it appears the price for Tidal Premium was raised from the originally-reported $9.99 a month to $12.99, and Tidal Hifi went up from $19.99 to $24.99.

UPDATE: According to Tidal, the higher fee for the monthly service is only when you activate the supscription through the Tidal app on your iPhone. You can still get the $9.99 or $19.99 pricing by first creating your Tidal account through Tidal's website, then go to the App Store to download the app. Once it's downloaded, you can login and you'll be on the correct pricing plan.

Both developments occur after Jay Z took to Twitter in defense of the streaming service.

"We are here for the long haul," Jay Z tweeted, going on to highlight Tidal's efforts to pay artists a higher royalty rates, as well as the service's push to discover emerging artists.

This isn't the first time Jay Z has gotten personally involved in promoting Tidal. Earlier this month, the rap star, along with Tidal investor Jack White, called individual subscribers to thank them for using the service.

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