The rap song in the first episode of Season 5 of Californication
could possibly be Act Like You Want It. This song is by rapper X5
featuring Mr. Fang.
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Californication returned on April 2014 for Season 7 and it's the
last season for the series. The finale episode for this season will
show on June 29, 2014.
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The song is "Old Man" originally done by Neil Young. The version
on Californication is a cover by James McCartney.