How is this movie music bass sound effect called?

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Hi!

I’m looking for music for my short film, and I would love to have a wobbing bass soundtrack like this:

http://www.dievantile.com/2009/06/candle-tornado/

You hear a wobbing base the whole time, does anybody how this is called and where I can find more music like this? I hear it a lot in films but I have a hard time finding it.

Thanks a lot!