Fortnite Festival is a music rhythm game set inside of Fortnite and while it only features controller support for now, you'll be able to use your Rock Band peripherals next year.
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Just announced! We will be playing King's Night in Den Haag / The
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Fortnite' Gets New Games: 'LEGO Fortnite', 'Rocket Racing', and 'Fortnite Festival' Launch This Upcoming Week-Chapter 5 Launch Trailer Live - XboxEra
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Rock Band revived as Fortnite launches first Festival season - Music Ally
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