New note type in Rock Band 3?

So, I was playing Expert Guitar on Rock Band 3, and I've noticed that in a couple of songs (I've only seen it in Foolin' by Def Leppard and Crazy Train, Ozzy Osbourne, but there are probably others), there's a section of notes I don't really recognize. Perhaps it was in Beatles Rock Band or Green Day RB. .. Either way, it's like the entire section under the notes is highlighted in the color of the note, and the notes themselves are a bit fatter. I can't figure out what the hell this means, and Google searches and consulting the manual have yielded me zero results. Any help would be appreciated.
 
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