Rock Band 4 to allow more freedom with improvisation for songs according to the studio.
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To start off a song, the drummer can count the band in with hits on the green tom. During drum fills, a randomly chosen fill from a set will display instead of the "go nuts" bars from the past. Vocals will be afforded much more freedom than in past games, with scoring based on following the given melody or for improvising a new one in tune.
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http://www.destructoid.com/rock-band...--291608.phtml