vocal fillers are the words we use to fill out or cover up when thinking of words to say.
Examples:
umm... uh.. hmmm.. so....
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While it is true that most fillers are to allow the manga to progress, in case of Naruto Shippuden, its mainly to milk it for what its worth, so to say. The manga is CONSIDERABLY ahead of the anime, so really they shouldn't have any reason to introduce fillers. So yea, milking it for what its worth.
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Another name for a vocal ensemble is a CHORUS
rons vocal range is eight octaves.