Music R&B

In "Let's Get It Started" by the Black Eyed Peas, what is the bass doing?

More Questions from Music R&B
What male R&B singer from the 90's does a duet with R Kelly on the 2007 song "Same Girl"?
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What label dropped Beyonce's group Destiny's Child before they could release a album?
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Who did Boyz II Men go on a "2 Legit 2 Quit" tour with?
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Which is actually the title of a Beyonce album?
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What artist did Dave Letterman interview on his first show of his second season of his Netflix show?
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Whose "True to Self" album hit No. 1 on the Billboard Hot 200 chart?
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Who is featured on Tamar Braxton's single "Let Me Know"?
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The 2015 hit R&B single "Hotline Bling" is performed by which artist?
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